My friend decided he wanted a bar code done on his neck. It looks really really bad, as the tattoo 'artist' didn't have a steady hand and the lines are all wavy and look like something my nephews would draw (they're three years old).
After he had it done, we were walking around a shop, we pretended to scan him at a checkout and told him he came up as a box of tampons lol

Oh and the worst I've seen is this guy with a cat on his belly and his belly button looks like the cats arse >.< I can't imagine wanting to snuggle up with a cats butt.