We have a few games that we've played. One is a penthouse game, others are cards/dice.
Really for us all they do is make us laugh and loosen up a bit, I feel. We can never take the game or each other seriously while we're doing it, but it always ends up a lot of fun. I enjoy the penthouse game the most (I can't remember what the name of the game is, though) it's so far away from what we normally do that we end up having a lot of fun attempting to follow through with some of the things!