Finally, a sport I can get behind. We used to play "quarters" in school.. if anyone remembers that it was two people taking turns flicking a quarter to keep it spinning until someone messed up, at which point they'd get the quarter flicked into their knuckles. The first person to bleed lost, or won, I can't remember. What exactly are the rules though? Seems if you use the lower portion of your hand it's pretty much like a punch.