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

In a comedy it helps enhance things that were already there.

The home viewing experience is slightly different and there's room for these kinds of extra excursions.

Well, actually, I did start out in comedies. Very, very early.

I call it like the domino theory of reality. If you can go one step at a time and it seems to make sense, you can then take your audience into an area that is relatively outlandish.

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.