John Belushi infused Animal House with this spirit of guerilla filmmaking. John Landis came from that world too, and all the National Lampoon writers were from that world. It was just chaos on film. Controlled chaos, though. We stayed very close to the script. It was a very formal kind of movie, if you look at it. Formally photographed and structured, with certain elements of improv.

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."

I love John F. Kennedy. My mother had been a worker on his campaign and adored him. I was just a kid when he was around. I did a lot of preparation, a lot of research. I can't do him... I sort of get a slight Boston accent, and I tried to get his rhythm. My only fear was that I was too old to play him, because I was much older than he was when he died, so I was concerned about that. But it was one of those, "Oh what the hell, I'm doing this. It's a great part, and I'm going for it."

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 think it's that if you don't have the visual, you have to infuse the full personality into the voice. Think of Daffy Duck. I mean, what the heck? I was playing around with the Daffy Duck voice today when I was coming back from driving my kid to school.

I allow myself to have my feelings of disappointment and discouragement, but never to sit and wallow in them. I meditate on positive energy, goals, and long-term happiness. Life has its ups and downs, so to expect otherwise is setting yourself up for disappointment.