I haven't seen this as much lately, but a few years ago I seem to recall places like A&F making rugby style shirts with numbers...most of which were "8"...which amongst the gays people seemed to interpret as cock size. I thought that was hysterical - the dude just bought some shirt, it doesn't mean he's got an 8-incher! The shirts were mass-produced, which 8" cocks are not!
What I thought was even funnier though was, if the common assumption was that the number on the shirt was the size of the dick, what were the guys thinking who bought shirts with numbers like "2" or "3"?