I did play a dentist in Waiting for Guffman. I wrote the speech at the conference. In the original script, when it got to that scene, it was, 'Thank you very much. Good night.' Literally. I just thought, 'He keeps talking about this speech. The keynote address is the big thing in his life and this is too important to say, "Thank you. Good night." I think we have to see and hear him doing what he does.' So I got together with my dentist and we worked through a few things.

It was fun to be in a scene again with [my wife LaTanya Richardson]. We used to do plays together all the time. We hadn't really worked together since Losing Isaiah [1995]. That was kind of early on in both of our cinematic careers. Things have changed a little bit since then.

Any changes that I made to my line, I asked if I could make them, which I do in every movie. So far everybody's been gracious enough to say yes. The only improvising I do is in the movies I do with Chris Guest, which is what we do.

I'm sure there are a lot of Italians who refer to themselves as goombahs and greaseballs and whatever. That's what people do. It gives them a sort of familiarity that other people don't have.

I did 'Formula 51' because I got to run around Liverpool in a kilt, with golf clubs.

If you have an opportunity to use your voice you should use it.

If there's an interesting role that comes up as a great support role in a decent picture, then I'll do that.