My buddies and I are going on vacation, and I plan on taking my XBox.
The three of us consist of a serious gamer (me), a guy who plays
occasionally, and a guy who doesn't game very much at all.

Obviously some of the games I consider fun (e.g. Dead Or Alive 3) will
be out of their league; I know the combos, but they've never played, and
none of us will have any fun.  Even stuff like cooperative Halo might be
a little too much for them to pick up and become skilled in just a week.

So what "party games" are out there that both gamers and non-gamers can
pick up fairly quickly and enjoy playing with each other?  The PS2 has
Mario Kart.  The Gamecube has Wario Ware.  What about the XBox?

Thanks to anyone who has suggestions!