I've always been a fan of science fiction films, and I've never been able to put my particular spin on it.

I've always believed in populating my films with characters who we like, who we have some warmth for, who have warmth for each other, who we would like to hang out with, who we emulate in one way or another. It's not that they all get along, or that there aren't bad people or people we make fun of. But at the core, there's a kind of sweetness.

It's been about 15 years, and I've never really worked seriously in CGI and I thought that here was an opportunity to do the kinds of things that I was not able to do on Ghostbusters.

We got some devastating reviews on Animal House at the start.

I'd love to do a musical actually. My background is in music. I have a bachelors in music. I thought that I was going to be a composer, long ago when I first started. So it was amazingly fun to do those two routines in the film.

I've always believed in populating my films with characters who we like, who we have some warmth for, who have warmth for each other, who we would like to hang out with, who we emulate in one way or another.

I remember when first, Stripes, and then Animal House came out - which I was really proud of, even though it was kind of loose and quite raucous - there were imitative movies that were not quite as good.