That's the thing about zombies. They don't adapt and they don't think. Literally, you could have a zombie on one side of a chain link fence and you could be on the other side and they could be trying to get to you and six feet down could be an open door and they will not go through that door in the fence. That's why they're so scary.

Sometimes you find your path, sometimes it finds you.

I think 'G.I. Joe' is a perfect example of how I'm the world's worst businessman. If I were smart, I'd be writing 'World War Z Part 12', but I have to go where the muse leads, and I've always been a huge 'G.I. Joe' fan. I always wanted to know more about these characters, these little plastic figures I played with as a kid.

Fear is the most basic emotion we have. Fear is primal. Fear sells.

I think the fascination with zombies is that they don't obey the rules of monsters. The first rule of monsters is that you have to go find them. You have to make a conscious choice to go to the swamp or the desert or the abandoned summer camp.

We live in such a service-based, globalised economy where very few people actually make anything and the people who do make stuff... it's all part of a massive global supply chain. So what if all those chains were suddenly cut, how would you make something? How would you keep people alive? And that was something I wanted to explore.

If I thought there was any hope of turning 'World War Z' into a movie, I wouldn't have written it as a giant, epic, global story, because that requires a giant, epic, global budget.