You don't want to take over the universe. You wouldn't know what to do with it beyond shout at it.

The trouble with a series as it gets older is it can feel like a tradition, and tradition is the enemy of suspense, and it's the enemy of comedy. It's the enemy of everything, really. So you have to shake it up.

I always rip out the last page of a book. Then it doesn't have to end. I hate endings!

I always tend to favor the newer idea.

Madness is just what a genius looks like to a tiny mind.

Amy Pond: 'I thought... well, I started to think you were just a madman with a box.' The Doctor: 'Amy Pond, there's something you better understand about me, 'cause it's important and one day your life may depend on it. [He Smiles] I am definitely a madman with a box.

Writing for adults often means just increasing the swearing - but find an alternative to swearing and you've probably got a better line.