sM.A.S.H. Drinking Game
A very very very fun game. Very high buzz factor. Supplies: people, beer, and episodes of MASH, the television show.
Simple rules: watch the show, any time a rank is said, drink. (ie. corporal, private, major, etc).
Of course, you can get creative add other rules like, drink whenever:
Klinger changes his clothes.
Hawkeye and sidekick drink
Frank kisses butt
Bombs go off
As usual, get creative.