set up 10 cups of beer on each side of a long table. The glasses are set up in a triangle like bowling pins. With a ping pong ball you take turns trying to land the ball in a cup of beer. If you are sucessful your oppent must drink the beer. When you get the last cup you win and your opponents must drink the remaining beer on your side. The game is also played with a partner in which case you and your partner would alternate throwing.
It is also advisable to have a cup of water to rinse the ball off before throwing. You really don't want to drink the dirt off the floor.
You may not touch or otherwise influnce the flight of the ball in any way. Depending on the rules you may defend your cup "off the bounce" but only after theball has had contact.