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.

That was a really interesting series [Threshold ] that I think would've been really great had it continued. I know Brannon Braga, who was running the show at the time, had a lot of really interesting ideas for what was going to happen the second, third, fourth, and fifth seasons, and they had it really planned out what was going to go on. But CBS just decided to pull the plug on it.

[Trey Parker and Matt Stone]called me one Saturday morning and said, "Can you do an impression of Conan O'Brien?" And I said, "I don't know." Because that was really... He hadn't been on the air that long, and to be honest, I hadn't watched much of him at that point. So I went to Santa Monica to their studio and said, "Well, what does he sound like?" They said, "Well, just try it one time. Read the copy." And I read the copy one time, and they went, "Okay, that's fine. Thanks a lot, that'll do. That's perfect."

So we [with Chris Ellis] did [Fresh Hell], and we did the first five episodes as a lark, just to see if anybody would respond or be interested, and we got enough feedback that was positive that we thought, "Let's keep going with this and see if we can flesh it out a bit this season." We've had 10 episodes, and they've been longer and a little more complete.

We [with John Logan] started talking about The Searchers, and then he went on to tell me a story about when he first met John Wayne, and he said, "Hey, you be me and I'll be Wayne," and I said, "No, let me be Wayne!" Anyway, it was a very pleasant conversation, it was clear to him that I was a big movie fan, and by the time I got home, there was a phone call, asking if I'd mind doing one scene in the movie [The Aviator].

I don't know if the character's come back and it was someone else playing it, or maybe they never did it again. But I loved it. It was a great part [The Joker] to play.

Joey being one of my finest performances ever. Matt LeBlanc's basically doing the same thing right now, playing himself on Episodes. When I did Joey, I really leaned on them to make me the biggest ass they possibly could, because, frankly, everyone in their heart of hearts thinks of themselves that way. Or at least I do, anyway.