This game involves between 3-8 players. You can have more if you really want though. Everybody should ideally be drinking different things. The more variety the better.
Everyone sits in a circle with a pack of cards spread out face down and a large kitchen jug in the middle. Someone turns over one card - say a nine. They then pour some of their drink into the jug. The next person turns over a card and then pours some of their drink into the jug. This continues around the circle until someone turns over a nine or whatever the initial card turned over was. That person then has to down the contents of the jug.
This game can be either incredibly harsh or relatively mild depending on what people are drinking and how long it is before the matching card gets turned over.