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].

I'm working on a script right about Civil War re-enactors who go back in time to the actual Civil War. It's kind of a big, crazy Back to the Future comedy. So, of course, it's the Civil War - I play the banjo. I was just having a conversation with one of the producers about some of the material and he was like, 'You know, we have to work in a scene where you play the banjo. And I was like I'll get behind that.

Getting any movie made is just like trying to push a giant boulder up a mountain, and there's so many moving parts. Obviously, there's the creative side, and then there's the logistical side, and they're both colossal.

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'm sort of laughing and so Zach [ Galifianakis] started laughing [on the set of The Hangover]. And Todd [Phillips] was baffled because what we were saying wasn't that funny, you know what I mean? And it was like all the baby's face. So Todd was like, 'What is going on? Get it together guys.'

Going into editing when I got to New York was part of that. I guess I just kind of wanted to know as much as possible. But I have a real love of the whole process, from start to finish. So right now, I fit into the acting part of the process, but I wouldn't rule anything out. I'm enamored with how the whole thing works.

The scene [in The Hangover] where the tiger actually pops up behind us, that's actually a Jim Henson tiger puppet. The Jim Henson Company actually supplied that tiger. And it's really cool. Its entire face moves. It has like all these little motors in its eyebrows and cheeks and mouth. It was amazing.