'Innuendo Bingo' is a game in which Chris Stark sits with a fellow player, they both have their mouths full of water, Scott Mills plays them clips of people saying things which could have rather rude meanings.... And the players try not to burst out laughing (and thus spit out the water).
So now that we've got that cleared up: here's what happened when the one and only Will Ferrell joined in the game when he appeared on the show in December. And put it this way: he's good at keeping a straight face. It's almost like he's some kind of actor!
(Via Tastefully Offensive)