@vegard back in the early 2000s, when the MPAA and DVD CCS battles were raging, a friend of mine had a shirt with the CCS decryption key on the back and "I am a circumvention device" on the front. It was very nerdy, but then he abruptly stopped wearing it. When I asked why, he explained that, apparently, a waiter misread it as "I am a circumcision device," which, you have to agree, gives that shirt a whole different meaning.
Anyway, the moral is, be careful when putting nerdy phrases on your shirts. :)