Drinking games - Kings and Blood.

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Simple game, simple rules. Very High buzz factor. Supplies: people, beer (as usual), and a deck o' cards.

Shuffle a deck of cards, spread out face down on a table. Place a cup, or some sort of container in center of table. Go around table drawing cards one at a time. If you draw a red card, drink twice. If you draw a black card, don't drink. If you draw ANY king, pour a desired amount of beer into the center cup. Whoever draws the final (fourth) king, must chug the center cup.

Game source: The (Un)Official Internet Bartender's Guide