[Mike Tyson] was fantastic. Well, here's the cool thing about Tyson. It turns out he's a huge fan of Old School, which was one of Todd Phillips' earlier movies. So he got to the set and he already liked Todd and he trusted Todd.

I wish there was a way to know you were in the good old days before you actually left them.

To be totally candid, it was really born out of a panic attack the summer between my sophomore and junior years, when I realized I wasn't going to graduate in four years unless I somehow managed to glue together all the courses I'd taken. That said, I'm really glad I did it, 'cause it was really fun, and I was able to just take whatever the hell I wanted.

It's incredible how big a part of my acting career music has become. I get asked about it all the time, and I love it. It's one of my favorite things, and I'm so glad that I get to sort of work that in.

The piano song that I do in the movie [The Hangover], it's a great example, that was never - that wasn't in the script.

As an actor, you can really play the intensity and gravity and seriousness of the moment, and just rely on the circumstances being funny. The joke is kind of the situation you're in, or the way you're reacting to something, as opposed to the characters just saying something witty.

It's incredibly fun to play someone that you don't like. It exorcises your own demons in a way. It's cathartic. We all have things that we don't like about ourselves, little things. And I get to amplify those things and put them out there. It's fun and it has a cleansing effect.