Buffalo: Throw a coin over your left shoulder and say "buffalo." For the rest of your life, any time you have a drink in your left hand and someone who has been "coined in says "buffalo," you must finish said drink immediately. While this probably sounds innocuous enough, the sadistic part is that he game is never over. I've been playing this since 2001 and have spread the game across numerous circles of friends on both sides of the country. To this day, I'll call my friends out west and if it sounds like they're drinking, I'll buffalo them, which is usually followed by ten seconds of silence and a "you son of a bitch."