A few months ago I took my PC into a PC repair shop as it wasn't turning on. When I went to pick it up, they handed me all the paperwork, and then placed on the counter a CDR, which I had left in the computer. On it, facing up, in big black marker was the words "Bum the Missing" - nothing else. The whole staff (about 5 nerdy and/or young looking guys) from the shop came out at that point to hear my explanation/see me squirm.
Blushing, I realised what it looked like and tried to explain (that it was a review CD version of the Bumsnogger/Among the Missing 7" that I had been copying on to my iPod), but I got the feeling it was convincing. Eventually, one guy said, "Bumsnogger, yeah, I've heard of them - heavy metal right?" - which helped, but as I was going out the door, one said "weirdest porn I've ever heard of"...