Perhaps because I'm American, most of them no longer seem to have ties to their original culture. The number thirteen, black cats, green cars, ringing ears...where did all of it come from? A lot of it is luck based: picking up a coin that's heads up, rabbits feet, four leaf clovers. Luck itself is an interesting concept, especially in that both good luck and bad luck are a consideration. And the notion that things come in threes. Unlucky things: stepping on a crack, seeing a bride on her wedding day, breaking a mirror.
