It gets so nasty, Matt Damon even mentions the 'G' word.... OH NO HE DI'INT!

For the record, if we had to choose just one of them to hang about with for the day (they're offering themselves as a Ben and Matt "double date" sandwich here, as it happens), it would definitely be Matt Damon. He's infinitely funnier. Observe...

If you can't view the video, here be the best line: "If you don't wanna get really wierded out by having existential questions posed to you by Ben Affleck, then maybe we could talk about other fun stuff, like stories from the set of the Bourne Identity, or any of the other hit movies I've been in."

Cool, so what was it like working with Matt Stone and Trey Parker?!