errorwear immortalizes your favorite computer errors as t-shirts. You may have seen BSOD shirts on your favorite Windows geeks (now available in WinNT and Win2k flavors). For web geeks, IE broken image, and default server responses. For me and probably three other people, Amiga Guru Meditation-- though unfortunately it's the less cute "Software Failure" of later versions of AmigaOS. (Older versions actually said "Guru Medititation".)

Their most popular shirt is both their geekiest-- it would require explanation to anyone but the greatest of '80s geeks and others who have seen this website, but involves iconic imagery even kids today might recognize-- and their most colorful:

There is no level 256 in Pac Man. Upon reaching this summit, the game simply breaks, and this is how it looks. For that added touch, we've also set the displayed score to be 3,333,360 which is the highest possible score. If you eat every dot, every ghost, and every fruit for 255 levels, this screen and this score are your rewards. Someone is even offering $100,000 to anyone who can get past this broken level.

(Thanks narilka.)