The biggest thing that comes out of improv that gets built on is just character traits. You know, for me the singing was born out of improv.

When I was 15 I lost a tooth and had an implant put in. Cut to 20 years later, I'm doing this part [Andy Bernard] and the script calls for my character to lose a tooth.

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].

Don't be afraid of fear. Because it sharpens you, it challenges you, it makes you stronger; and when you run away from fear, you also run away from the opportunity to be your best possible self.

The Daily Show was an incredible training ground for that kind of thing. It was all about discipline and generating material constantly.

What's cool is that in the story of the movie [The Hangover] our characters are also really kind of getting to know each other and bonding over the course of the movie. And I think you're seeing a real, a literal sort of friendship growing both in us as actors and on screen as characters.

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.