An ambitious acceptance criterion.
A very simple requirement for anyone who has ever debugged software.
Back · WhiteMake No Mistakes. Tee
$45
Size guide
Boxy by design. Take your usual size for the boxy look, one down for a closer fit.
| Flat, in | XS | S | M | L | XL | 2XL | 3XL |
|---|---|---|---|---|---|---|---|
| Chest width | 19 1/8 | 20 1/8 | 21 1/8 | 23 1/8 | 25 1/8 | 27 1/8 | 29 1/8 |
| Length | 26 1/2 | 27 1/2 | 28 | 29 | 30 1/4 | 31 3/4 | 32 3/4 |
Bella+Canvas 3010, measured laid flat. Chest is armpit to armpit; double it for the full round. Each piece can differ by up to 2 in (5 cm).
Made to order, final sale. Paid size exchange within 14 days; misprints replaced free. Exchanges & Returns
- Blank
- Bella+Canvas 3010 boxy tee
- Fabric
- 100% Airlume cotton, 6 oz
- Fit
- Unisex oversized, boxy
- Front mark, full back, printed neck label
- Shipping
- Printed in 2-5 business days. $5.95 in the US, free over $90
The brief looks straightforward until someone starts implementing it. For developers, reviewers, and anyone familiar with the distance between a clean instruction and a working system.
Clean front. Loud back. A small REGEX wordmark sits on the chest, with the main line across the back. One ink per garment. Comes in Black with white ink or White with black ink.
The joke, explained
Make no mistakes sounds like firm everyday advice. In software development, it also reads like an impossible specification delivered without details. The humor comes from its absolute confidence: complex work has been reduced to a command that offers no help with the errors everyone is trying to avoid.
For the reviewer with one small request: zero defects.
- Fit
- Unisex, boxy oversized fit with a dropped shoulder. Choose your usual size for the boxy look or one size down for a closer fit.
- Fabric
- 100% cotton, about 6 oz, soft and midweight.
- One ink with a light vintage texture. White ink on Black, black ink on White. REGEX on the chest, the line across the back.
- Care
- Wash cold inside out. Tumble dry low or hang dry. Do not iron the print or use bleach.
- Shipping
- Into the build queue. Printed to order in 2 to 5 business days, then shipped. Free US shipping on orders of $90 or more.
Questions
Why does this sound like a software requirement?
It states the desired outcome with complete confidence and no implementation detail. Developers recognize the gap between asking for flawless work and explaining how a system should behave.
Is there a second technical command hidden in the wording?
The joke does not require a hidden command. Its force comes from treating an ordinary warning as a specification, leaving the wearer to appreciate how much work those words omit.



