Betting games to play while at Basketball Games
 

Sorry for the confusing title, anyways:

I was at the United Center today for the first round games. This group of 5 guys were playing this betting game that consisted of a tamborine and having to shake it everytime a 3 is attempted and made. They'd pass the tamborine every minute and would get money from the others if a three was hit while they held the tamborine.

Does anybody know the rules to this game, or have other fun things they like to play what at a basketball game? Looking for some ideas when I go back to the United Center on Sunday.