There's an awful lot of scenes where we don't know what the scene's going to be about, we ask the audience, pick a place that the scene is happening, pick the relationship, tell us who they are, things like that.

I think initially it's terrifying because going into a show where, you know, "Oh, I'm going to be on stage for two hours, I have no lines to memorize, I have nothing really prepared," and actually I say that, the show is not all improvising.

The first big thing that I did with my dad was the bicycle sequence in "The Great Muppet Caper," where Kermit and Piggy are riding bicycles in Battersea Park in London and that was a complex marionetting and cranes driving through the park, it was a complicated scene, and I did that with my dad.

People would say to him, "When you finish a movie, did it come out as good as you thought it was going to?" Or, "Did it come out the way you intended it to come out?"

First of all, you're improvising through a puppet, so you're not always yourself: you're a cow or you're a pig or you're an old woman, you know, whatever puppet you pick, or you're a demon, you know, whatever you pick up, that's what you get to be in the scene.

And that was always my father's favorite part about shooting as well. Often my dad would shoot very, very late, he was quite a workaholic, they would do 20, 20-hour shoots and stuff like that.

It's really great to do one piece, "I've Grown Accustomed To Your Face," my dad developed in 1956, when he was 20 years old, and it's great to do that piece again now and see that it still really works as well as it ever did.