Humor does depend on surprise, and the things that people remember as the funniest things in the world, you look at later and you go, "What? What was that all about?"

On 'The Simpsons,' I will say that we definitely like to comment on what's going on in the world, and we try to be funny. If we can figure out a way of being funny about it, then we've gone part of the way of accomplishing our task.

'The Simpsons' was about children and married parents; 'Futurama' is about people in between; they're growing up and haven't settled down. Every other cartoon show seemed to be, you know, dumb dad, bratty kids.

If at first you don't succeed - give it up. It isn't worth the pain.

I have less to do with 'The Simpsons' every season, but I stick my nose in here and there. Basically, it's just trying to keep the characters consistent and making sure the show has a soul.

Part of the fun of being alive is knowing that you're annoying the hell out of someone else.

I know for a fact, obviously, because my kids grew up watching the show, that there are some things they are introduced to from 'The Simpsons', and then later in life they see the thing we're parodying. My kids had not seen 'Casablanca,' and we'd done parodies of 'Casablanca.'