The thing about a cartoon is, you can do whatever you want. The tightrope that we are walking on 'The Simpsons' and 'Futurama' is "How do you continue to surprise the audience, but make them good surprises?" Not every surprise is good, but you want to continue jolting people.

Weaseling out of things is important to learn. It's what separates us from the animals... except the weasel.

'The Simpsons' basically - and 'Futurama' - are really smart shows. They're kind of disguised as these goofy animated sitcoms, but the references within the shows, if you're paying attention, are pretty smart and pretty sophisticated.

In 'Futurama,' the skin color is no longer yellow. They have actually evolved to cartoon skin tone. But they still have four fingers.

Science fiction and comedy are generally a pretty bumpy mix.

One of the great things about the Internet is that you can read what everybody has to say about everything. It is fascinating to me, the critiques about humor by people who have no sense of humor.

We did 'The Simpsons Movie,' which took almost four years; it was the same people that do the TV show, and it just killed us. So that's why there hasn't been a second movie. But I imagine if the show ever does go off the air, they'll start doing movies.