I like the characters. It's easy to have someone being chased by a giant were-beast, but you have to make him or her interesting so that people feel for him or her while they're being chased.

If you can't create somebody that you're rooting for - unless you are creating a villain - you're creating a non-sympathetic character.

Do you find that you tend to characterise the monsters as much as the people?

We have a couple of people who are taken over by demons, and we try to keep a little bit of the character to them, but with the others we're going for generic fun and scary things. We wanted to make it fun.