In keeping with the zombie theme (established by accident earlier this week), I'd like to recommend a card game: Give Me The Brain. If you're the sort of person who regularly attends a game night, or just spends a lot of time playing games, you've probably run across it already.
As a card game, the goal is simple: the first person to discard all his (or her) cards wins the game. The rules aren't terribly complicated, and you can learn the game in five or ten minutes. It's best played with four to six people... and it's best played if you read the cards out loud as you play.
Why? Because it's the setup that really makes the game. You're a zombie, working in Friedeys - The Fast Food Restaurant Of The Damned. All your co-workers are zombies, too, and you all share one simple goal: to finish up your tasks (represented by the cards in your hand) so you can go home. There's a catch, of course: some of the tasks require a brain... and there's only one brain among the lot of you... and if you use the brain, there's a good chance that you'll drop it immediately afterwards.
Winning requires a mix of luck and strategy, but the game is an awful lot of fun even if you lose. It's silly, it's random, it's hilarious. Pick up a copy at your local gaming store (Comic Book stores often have it, too), or order it from Steve Jackson Games.
"Give me the brain... I forgot what lettuce is!"