I read Animal House and I said, "I will burn down a house to be in this. I have to be in this movie." I read 1941 and I went, "Well, if Steven Spielberg likes it..." But it just wasn't on the page. It was a very big, unwieldy thing, and there were so many characters. It was fun to shoot, but I didn't know what the core of it was.

I must say Steven Spielberg was great to me, and I loved working with him. He called me up on the phone and was like, "I want you to be in this movie - 1941. There are a couple of parts. You can take whichever one you want. One of them is a main character who is involved in everything, and there's another character who has his own storyline and goes off on his own. He's probably the funnier, more unique character." I said, "Well let me do that second one."

The core of Animal House was about prejudice, about equality, and about inclusion/exclusion. It was about a group of people who were together and anything went. Anybody who wanted in could get it in. Then there was that other group that nobody could get in, unless they were white, and just alike. It was very representative of the culture in the '60s, '50s, and '40s in America.

With comedy, you really want to work things out beforehand.

The funny thing about The West Wing is - and I don't know what Aaron Sorkin says about it - but I'm convinced it was a comedy. It's a very intellectual and cerebral comedy, but it was SportsNight in the White House. It had an energy and a vitality and an intelligence and a passion that's rare. And it was extremely difficult to do, because they were so demanding about the dialogue.

When I worked with Chevy Chase, Michael Ritchie would say, "Just ad lib and try to break me up. Just insult me. Anything." When we were doing his close-up, or when my back was to the camera, I would come up with jokes or quips or anything, to get a real reaction out of him. He was smart enough to know that was gold. So it was great fun working with him and Michael, and getting to see how the two worked together. I think Fletch and Clark Griswold were Chevy's two best roles. He's so incredibly talented and still vastly underused.

I'll never forget John Heard doing Shakespeare In The Park with Raul Julia and Richard Dreyfuss. It was 30 years ago, I guess. It was Othello, and John Heard played Cassio, and while everyone else was "Acting!" Heard came on talking normal, and everyone in the audience was leaning in to follow him. I wasn't doing that in Bus Stop. I think in that performance, I was putting it out a little too much.