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.

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 got some devastating reviews on Animal House at the start.

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.

My first student film was Orientation, which was basically the set-up for Animal House. There are a couple of scenes that we later borrowed in some form.

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.