The goal of the game is to smack the other player's cup with the ping pong ball, assuming the regular rules of your average ping pong game. Each time that your cup is hit, you have to drink. Naturally. If the other player knocks your cup over with a particularly powerful smash, you have to clean the mess, get a fresh cup of beer, and down the entire contents.
You can make up your own special rules. You can keep score, but generally, a person loses when they have to drink the entire cup. Or if you have a large number of people eager to play, you should keep score and play to, say, 10.
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