Gametender

Each player needs his or her own cup. When everyone is ready, you start. Two people, sitting opposite from one another, fill their cups about halfway, maybe two-thirds (it's really a matter of personal choice). Chug the beer. When one person's cup hits the table, the person sitting directly to the left fills his or her cup halfway and chugs it.

The point is that the two cups chase each other around the table until one catches the other. When both cups end up at one person, that person drinks both beers. Then the game restarts.