Never Have I Ever is a game wherein you go around and each person says something they've never done and if you have done that thing, you take a shot/sip (we opted not to do that part at this sleepover). You start the game with all ten fingers up, and for each thing you've done, you put one finger down. We played that the last person to have any fingers left up "won," but one can also play that the first person to have all their fingers down "wins."

http://en.wikipedia.org/wiki/Never_have_I_ever