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.

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.

It's a fascinating culture [the South in the Civil War period] and so rife with comedic possibilities. And not in a way that...I have no intention of making fun of re-enactors. I think it's more just a celebration of their passion and enthusiasm, which is so infectious and maybe at times a little misguided.

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.

One of the biggest breaks we had actually, one of the biggest, the hardest I laughed on the movie [The Hangover] was the baby was just doing ridiculous things and making hilarious faces. But I'm sitting there and I'm supposed to be having this exchange with Zach [ Galifianakis] and the baby is like staring at me with these huge eyes and acting, and just making the most cerebral faces, and I could not keep it together.

I'm the worst in The Office. It's a problem. They've had to shut down the set for like 30 minutes because of me.

This may come as a surprise, given the nature of my job, but I am very guarded and contemplative. I'm not a naturally boisterous person.