I heard this on a recent podcast, and it sounded like a lot of fun.
I will think of a video game, it can be any video game at all. People ask yes or no questions to narrow it down. Whoever finally guesses it correctly gets to do the next game.
EDIT: Also, please choose fairly common games. It's hard enough to guess without having to know about the existence of some obscure title.
Okay, I'm thinking of a game. Fire away!