This item has had a high sales volume over the past 6 months.
  • May include: A black short-sleeved t-shirt featuring a graphic of a black cat sitting in a corner facing a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A denim blue t-shirt featuring a graphic of a black cat sitting in front of a wall covered in complex physics equations. The text above the cat reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." The shirt has a crew neck.
  • May include: A berry-colored t-shirt featuring the text "Meanwhile, inside the box, Schrödinger's cat plans its revenge." Below the text is a graphic of a black cat sitting and facing a wall covered in complex mathematical equations and diagrams.
  • May include: A charcoal gray t-shirt featuring a black cat sitting in front of a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." The shirt has a crew neck.
  • May include: A black t-shirt featuring the white text "Meanwhile, inside the box, Schrödinger's cat plans its revenge." Below the text is a graphic of a black cat sitting in a corner facing a wall covered in complex mathematical equations and diagrams.
  • May include: A charcoal gray short-sleeve t-shirt featuring a black cat sitting in front of a wall covered in complex physics equations and the text, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." The shirt has a crew neckline.
  • May include: A navy blue t-shirt featuring a graphic of a black cat sitting in front of a wall covered in white physics equations and diagrams. The text above the cat reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A blue crew neck t-shirt featuring the white text "Meanwhile, inside the box, Schrödinger's cat plans its revenge." Below the text is a graphic of a black cat sitting in front of a wall covered in complex physics equations and diagrams.
  • May include: A dark olive green t-shirt featuring a graphic of a black cat sitting in front of a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A brown short-sleeved t-shirt featuring a graphic of a black cat sitting before a wall covered in complex physics equations. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." A circular brown tag labeled "Espresso" is visible.
  • May include: A dark forest green crewneck sweatshirt featuring a graphic of a black cat sitting in front of a wall covered in complex physics equations. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A charcoal gray crewneck sweatshirt featuring a graphic of a black cat sitting before a wall covered in complex mathematical equations. The text above the cat reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A maroon long-sleeve sweatshirt featuring a graphic of a black cat sitting before a wall covered in complex mathematical equations. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A size guide for Comfort Colors 1717 t-shirts featuring four views of a charcoal grey shirt labeled Small and Large. Includes text stating model height and weight, plus an adult unisex sizing chart with width and length in inches.
  • May include: A collection of folded t-shirts arranged in a grid, showcasing a wide variety of colors including white, ivory, banana, butter, mustard, terracotta, burnt orange, yam, grey, granite, island reef, chalky mint, seafoam, light green, bay, khaki, sage, moss, hemp, blue spruce, chambray, lagoon blue, flo blue, orchid, violet, grape, ice blue, blue jean, midnight, true navy, blossom, crunchberry, watermelon, heliconia, red, berry, brick, crimson, chili, espresso, graphite, pepper, and black.
  • May include: A charcoal gray short-sleeve t-shirt displayed next to a list of washing and care instructions. The text reads: WASHING & CARE Instructions, TURN GARMENT INSIDE OUT, MACHINE WASH COLD, DO NOT IRON ON PRINT, DO NOT BLEACH, DO NOT DRY CLEAN, DRY ON LOW SETTINGS.
  • May include: A beige informational graphic with brown text and illustrations. The header reads WHY SHOP WITH US? Four boxes contain icons of a pocket watch, thread spool, sewing machine, and clock, with text describing service features and contact info.
  • May include: A black short-sleeved t-shirt featuring a graphic of a black cat sitting in a corner facing a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • Product video
  • May include: A denim blue t-shirt featuring a graphic of a black cat sitting in front of a wall covered in complex physics equations. The text above the cat reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." The shirt has a crew neck.
  • May include: A berry-colored t-shirt featuring the text "Meanwhile, inside the box, Schrödinger's cat plans its revenge." Below the text is a graphic of a black cat sitting and facing a wall covered in complex mathematical equations and diagrams.
  • May include: A charcoal gray t-shirt featuring a black cat sitting in front of a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." The shirt has a crew neck.
  • May include: A black t-shirt featuring the white text "Meanwhile, inside the box, Schrödinger's cat plans its revenge." Below the text is a graphic of a black cat sitting in a corner facing a wall covered in complex mathematical equations and diagrams.
  • May include: A charcoal gray short-sleeve t-shirt featuring a black cat sitting in front of a wall covered in complex physics equations and the text, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." The shirt has a crew neckline.
  • May include: A navy blue t-shirt featuring a graphic of a black cat sitting in front of a wall covered in white physics equations and diagrams. The text above the cat reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A blue crew neck t-shirt featuring the white text "Meanwhile, inside the box, Schrödinger's cat plans its revenge." Below the text is a graphic of a black cat sitting in front of a wall covered in complex physics equations and diagrams.
  • May include: A dark olive green t-shirt featuring a graphic of a black cat sitting in front of a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A brown short-sleeved t-shirt featuring a graphic of a black cat sitting before a wall covered in complex physics equations. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge." A circular brown tag labeled "Espresso" is visible.
  • May include: A dark forest green crewneck sweatshirt featuring a graphic of a black cat sitting in front of a wall covered in complex physics equations. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A charcoal gray crewneck sweatshirt featuring a graphic of a black cat sitting before a wall covered in complex mathematical equations. The text above the cat reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A maroon long-sleeve sweatshirt featuring a graphic of a black cat sitting before a wall covered in complex mathematical equations. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."
  • May include: A size guide for Comfort Colors 1717 t-shirts featuring four views of a charcoal grey shirt labeled Small and Large. Includes text stating model height and weight, plus an adult unisex sizing chart with width and length in inches.
  • May include: A collection of folded t-shirts arranged in a grid, showcasing a wide variety of colors including white, ivory, banana, butter, mustard, terracotta, burnt orange, yam, grey, granite, island reef, chalky mint, seafoam, light green, bay, khaki, sage, moss, hemp, blue spruce, chambray, lagoon blue, flo blue, orchid, violet, grape, ice blue, blue jean, midnight, true navy, blossom, crunchberry, watermelon, heliconia, red, berry, brick, crimson, chili, espresso, graphite, pepper, and black.
  • May include: A charcoal gray short-sleeve t-shirt displayed next to a list of washing and care instructions. The text reads: WASHING & CARE Instructions, TURN GARMENT INSIDE OUT, MACHINE WASH COLD, DO NOT IRON ON PRINT, DO NOT BLEACH, DO NOT DRY CLEAN, DRY ON LOW SETTINGS.
  • May include: A beige informational graphic with brown text and illustrations. The header reads WHY SHOP WITH US? Four boxes contain icons of a pocket watch, thread spool, sewing machine, and clock, with text describing service features and contact info.
Report this item to Etsy

Schrödinger Cat T-Shirt, Funny Physics Shirt, Quantum Cat Nerd Tee, Science Humor Graphic, Smart Cat Meme Shirt

OldRetroTees  

Item highlights

  • Made to order

Seller's description

Schrödinger Cat T-Shirt, Funny Physics Shirt, Quantum Cat Nerd Tee, Science Humor Graphic, Smart Cat Meme Shirt

✨ MEET YOUR NEW FAVORITE TEE
Elevate your everyday look with our exclusive design. Whether you're hanging out with friends or relaxing at home, this tee combines unique vintage style with everyday comfort.

🎨 Looking for a specific color?
The colors listed below are the options currently available in our Etsy dropdown menu.
If you’re looking for a different color, feel free to message us — we’ll be happy to check availability and print your item in your preferred shade 💬🎨

💛 Not sure which color or style is right for you? Just reach out — we usually reply within 24 hours.

👕 OUR APPAREL

✨ Comfort Colors® 1717 T-Shirts
• Garment-dyed for a true vintage look
• Soft, lived-in feel from the first wear
• Heavyweight fabric with a relaxed fit

👕 Gildan® 5000 T-Shirts
• Classic midweight fabric
• Durable and reliable for everyday wear
• Smooth surface for clean, long-lasting prints

🧥 Gildan® 18000 Sweatshirts
• Cozy fleece blend, soft on the inside
• Warm, durable, and great for layering
• Classic fit that holds its shape

🕒 PRODUCTION TIME
Some colors may take a little longer to produce, but we always do our best to ship all orders within 5 business days.

📦 MADE JUST FOR YOU
Each item is printed to order using high-quality inks for vibrant, long-lasting designs.

💌 OUR PROMISE
Because this item is custom-made, we don’t accept returns.
However, if there’s any issue with your order, message us — we’ll make it right.

🧺 CARE INSTRUCTIONS
Keep your tee looking fresh:
• Wash inside out at 30°C (90°F).
• Air dry only (skip the tumble dryer).
• Do not iron directly on the print.

With love,
OldRetroTees 🤍

View more

Item review

Why this review appears

All reviews are from verified buyers. This review is shown automatically based on factors like recency, whether it includes comments, your chosen language, and whether the rating reflects the typical experience with the shop.

Summarized by AI

Love it Looks great Perfect gift Fast shipping

“I have not seen item, but it was a gift to my brother and he loved it. He is a geek and has a black cat so was perfect for him”

Vickie

Today

View all

20+ views in the last 24 hours

Price:$20.79+

Original Price: $39.98+

48% off

•

Limited time sale

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You can only make an offer when buying a single item

Shipping & return policies
  • Get it by
    Nov 20-27
  • Cost to ship
    $5.99 to United States, 43215.

Reviews for this item

What buyers say, summarized by AI: Love it Looks great Perfect gift Fast shipping

5.0

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience.

(19 reviews)

4.9 Item quality
4.9 Shipping
4.9 Customer service
100% Buyers recommend
Filter by category
5 out of 5 stars 5 This item

Vickie Nov 13, 2026

I have not seen item, but it was a gift to my brother and he loved it. He is a geek and has a black cat so was perfect for him

Vickie Nov 13, 2026

5 out of 5 stars 5 This item

Elisabeth Nov 3, 2026

This shirt is so funny! I would buy from this seller again!

Elisabeth Nov 3, 2026

5 out of 5 stars 5 This item

Cindi Nov 3, 2026

My daughter is going to love it

Cindi Nov 3, 2026

5 out of 5 stars 5 This item

Etsy buyer Oct 26, 2026

I loved the design and so did the person I gave it to.

Etsy buyer Oct 26, 2026

Photos from reviews

Seller's description

Specifications

May include: A black short-sleeved t-shirt featuring a graphic of a black cat sitting in a corner facing a wall covered in complex physics equations and diagrams. The text above the graphic reads, "Meanwhile, inside the box, Schrödinger's cat plans its revenge."

Schrödinger Cat T-Shirt, Funny Physics Shirt, Quantum Cat Nerd Tee, Science Humor Graphic, Smart Cat Meme Shirt

✨ MEET YOUR NEW FAVORITE TEE
Elevate your everyday look with our exclusive design. Whether you're hanging out with friends or relaxing at home, this tee combines unique vintage style with everyday comfort.

🎨 Looking for a specific color?
The colors listed below are the options currently available in our Etsy dropdown menu.
If you’re looking for a different color, feel free to message us — we’ll be happy to check availability and print your item in your preferred shade 💬🎨

💛 Not sure which color or style is right for you? Just reach out — we usually reply within 24 hours.

👕 OUR APPAREL

✨ Comfort Colors® 1717 T-Shirts
• Garment-dyed for a true vintage look
• Soft, lived-in feel from the first wear
• Heavyweight fabric with a relaxed fit

👕 Gildan® 5000 T-Shirts
• Classic midweight fabric
• Durable and reliable for everyday wear
• Smooth surface for clean, long-lasting prints

🧥 Gildan® 18000 Sweatshirts
• Cozy fleece blend, soft on the inside
• Warm, durable, and great for layering
• Classic fit that holds its shape

🕒 PRODUCTION TIME
Some colors may take a little longer to produce, but we always do our best to ship all orders within 5 business days.

📦 MADE JUST FOR YOU
Each item is printed to order using high-quality inks for vibrant, long-lasting designs.

💌 OUR PROMISE
Because this item is custom-made, we don’t accept returns.
However, if there’s any issue with your order, message us — we’ll make it right.

🧺 CARE INSTRUCTIONS
Keep your tee looking fresh:
• Wash inside out at 30°C (90°F).
• Air dry only (skip the tumble dryer).
• Do not iron directly on the print.

With love,
OldRetroTees 🤍

Delivery details and policies

  • Get it by
    Nov 20-27
  • Returns and exchanges
    Not accepted
  • Ships from
    Hialeah, FL
  • Cost to ship
    $5.99 to United States, 43215

    There was a problem calculating your shipping. Please try again.

Shop with confidence
Star Seller

This seller consistently earned 5-star reviews, shipped orders on time, and replied quickly to messages.

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Climate investments

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Meet your seller

OldRetroTees
Raisa
OldRetroTees ·

United States

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience. 4.9
·
2.5k sales
·
10 months on Etsy

Usually responds in a few hours

Smooth shipping Has a history of shipping on time with tracking.

Speedy replies Has a history of replying to messages quickly.

Rave reviews Average review rating is 4.8 or higher.

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Listed on Nov 13, 2026
232 favorites
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