Nothing can ever be a rule in drama, because then you're saying certain things won't ever happen, and that would be very boring.

Fascinatingly confident, rude people are great.

Brainy's the new sexy.

You should always waste time when you don't have any. Time is not the boss of you. Rule 408.

The Doctor: Just had a fall. All the way down there, right to the library. Heck of a climb back up. Amelia: You're soaking wet. The Doctor: I was in the swimming pool. Amelia: You said you were in the library. The Doctor: So was the swimming pool.

When writing comedy, you have to have the confidence to believe that there is only one type of relationship in the world, and we are all having it, that all men behave in the same way and so do all women.

See the bowtie? I wear it and I don't care. That's why it's cool.