Boom!
The middle of the table has a bunch of cups filled with beer.
Two empty cups on the sides, two ping pong balls. Everyone circles up around the table.
Try to bounce the ball into the cup when it gets to you (a la quarters.)
When you make it, you pass it to your right. If you make it on your first try you can pass it to anyone on the table.
If you make your ball in your cup before the person immediately to your , you slap their cup out of the way and yell BOOM! then pass the cup to the person to their right.
The person who just lost their cup grabs a full one from the middle and chugs it, and goes back to trying to make the ball into the cup and the game continues.
It can get really competitive, and you can mess with people by making them chug over and over due to people making it on their first try and passing it back to the person immediately to the chugger's left.
It's really fun and a good way to get more people involved rather than beer pong limiting you to four players.