Rin, a software engineer I know, has a tattoo on his arm in a language that constantly makes people ask for a translation. This has become a standing joke in the form of a bet where he says to anyone interested that he will pay them $10 if they can tell him what language the tattoo is in. In over ten years, only one person has known the language, a woman working a food cart at a fair. He was so impressed, he happily handed over his money.