I think training in comedy, as it were, a history writing comedy, is a powerful tool for anyone.

Amy: I had something I wanted to tell him. Stuff always gets in the way. Canton: Stuff does that.

You can be as beautiful and charming as you'd like, but if you're not terrific at acting, it will mean nothing on the screen.

Rule 1: The Doctor lies.

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

The Doctor: This is bad, I don't like this. [kicks console and yells in pain] Never use force, you just embarrass yourself. Unless you're cross, in which case... always use force! Amy: Shall I run and get the manual? The Doctor: I threw it in a supernova. Amy: You threw the manual in a supernova? Why? The Doctor: Because I disagreed with it! Now stop talking to me when I'm cross!

I'd forgotten not all victories are about saving the universe.