I mean they [ Bradley Cooper, Zach Galifianakis] are both just really good guys and also they're both extremely funny in very unique ways. We made each other laugh an awful lot, and that goes a long way. And we also went through some hard times. I mean it was hard to make this movie [The Hangover].

We spent six weeks there [in Vegas]. The only thing crazy that I did was shoot that movie [The Hangovers]. The stuff in that movie is way crazier than anything I might have done, drunk one night in Vegas. I mean we did it for real in the movie, so that's as crazy as it got.

It was never tough [ being the new guy]. It's just the warmest group of people [The Office stuff] you could ever hope to work with.

We played around and improvised a ton [in The Hangover], and I think it's hard to say at this point what's what. Gosh, I wouldn't even know how to take a stab at it. The script was so good that we really didn't need to improvise very much, but I think we just found a lot of moments on the set. It's really cool when you get onto the set of a movie and you start shooting the scenes and you start to actually incorporate the environment.

You take a vacation to a place like Thailand and you're ready for the excitement of something new and foreign. But when you're working 14-hour days, all you want is something familiar to ground you. And there's just nothing there.

Improvisation is about finding the best joke or the silliest way to get something across. Improvising conflict is always fun because you can just go for it.

I think that music at inappropriate times with inappropriate volumes can be the funniest thing ever.