I always thought that Bill Murray was one of the great actors that I've worked with. And I've worked with all kinds of people who are known primarily for their dramatic work.

A good actor is someone who knows how to take the part and make it real and make it honest and be effective in it. If it's in a funny movie and, as long as they are cast in an appropriate way, humor will come from it.

I believe that improvisation is really just a directorial tool. It's a writing tool. It's not so much that the actors get to say whatever they want, whatever pops into their head. It's an opportunity to write the last draft of the screenplay as you're working on it.

There's been an amazing backlash for the last decade in America: political correctness. In many ways, I think that, while we've been remarkably violent in our media, there's been a real schizophrenia. In private, on the Internet, and on public-affairs shows or talk radio, we're way more explicit than we've ever been. But traditional Hollywood has been much more frightened than it ever was in the '70s about presenting things that could be perceived as politically incorrect.

I'm not sure I agree with the thesis, because I think that even though something grotesque or gross has been part of film since way back, what we accept or what we can get away with on the screen is broader now.

We watch movies about all sorts of things that we don't know anything about, but we do get caught up in the human drama.

I think Junior is certainly a science fiction premise as is Twins, as is Dave, beyond Ghostbusters.