There's such a grand fraternity of actors who've played the Joker, not the least of whom is Mark Hamill, who voiced it for so long and was so great. I did it one time and... I've gotten some feedback on it from people who've seen it and really enjoyed it, but I don't know.

Dr. Okun. Who's named after a special-effects guy named Jeff Okun, who had done Stargate for Roland Emmerich and Dean Devlin, who did Independence Day. But "Brakish" just came up one day when Jeff Goldblum and I were improvising, and he told me his character's name and I told him mine.

I wanted to look right. I remember a review - a very positive one - in The New York Times that said I was so good in the role [Earl Mills] that I "even managed to overcome a terrible red wig." I wanted to write her and tell her about the agony I'd gone through with the perm, but I thought better of it.

The character of Brent Spiner. We certainly collaborate on the concept of that, but he basically writes the script, then it's sort of a combination of his voice and my voice.

I don't know you could do a whole film about Dr. Okun from Independence Day.

I assumed, "Well, I must've sounded like Conan O'Brien, or a reasonable facsimile or something." And there I am in the movie [South Park: Bigger, Longer & Uncut ]. I was very lucky.

My own personal favorite Cher song is the unforgettable Gypsies, Tramps and Thieves.