The comic edge of Ghostbusters will always be the same. It's still treating the supernatural with a totally mundane sensibility. In the world of ghostbusting, there are certain givens. You're always going to have some new invented technology, some pseudo-science that sounds right because we drop enough familiar terms from physics and engineering, and pseudo-methodology, something that people will think they may have read something about before.

There's something very edgy about Bill Murray out there improvising.

I feel a big obligation to the audience, almost in a moral sense, to say something useful. If I'm going to spend a year of my life on these things, I want something that I feel that strongly about.

Comedy is essentially made by young men, or older men with some form of arrested development, for young men or immature older men.

Films are big hits when they touch a lot of people. Things are not funny in a vacuum, they're funny because we respond to some personal dislocation, some embarrassment, some humiliation, some pain we've suffered, or some desire we have.

Just expressing contempt for your leaders doesn't really accomplish anything.

Somebody once told me that if you laugh at a George Bush joke, or you send an email cartoon to your friends that makes Bush look like a fool, you feel like you've done something significant. But really, what have you actually done? Just expressing contempt for your leaders doesn't really accomplish anything.