Think Geek by Request.
I'm not dumb. I get binary jokes...
Heavyweight 100% cotton t-shirt in blue with binary code 'dripping' down the tshirt. There are three sequences of code which stick out from the background. Together, these three sequences spell out 'you are dumb' in ascii binary. The background just repeats 'repeating background' in the same ascii binary. Heh.
Want a different Thinkgeek T? well send me a message with the url and i'll do it!