You take this cold, remarkable, difficult, dangerous, borderline psychopath man, and you wonder what might have happened to him had he not met his best friend, a friend that no one would have put him with, this solid, dependable, brave, big-hearted war hero. I think people fall in love, not with Sherlock Holmes or Dr. Watson, but with their friendship. I think it is the most famous friendship in fiction, without a doubt.

If anyone said to me 'invent a new monster so we can sell more toys', I'd kick them out of my office.

It's a fez. I wear a fez now. Fezes are cool.

Always take a banana to a party.

The Doctor: I've seen bigger. Clara: Really? The Doctor: Are you joking? It's massive!

The difference between a beautifully made failure and a beautifully made hit is who you've got playing the leads.

If you don't expect to like someone and then you do, that's an incredibly exciting moment.