I can say with pride verging on smugness that I've got two very successful shows that assume their audience is very smart.

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

The Doctor: Doctor Song, you've got that face on again. River: What face? The Doctor: The "He's hot when he's clever" face. River: This is my normal face. The Doctor: Yes it is. River: Oh, shut up. The Doctor: Not a chance.

It's a TV show. Only the emotional damage is real.

I don't want to think that the stories are finite; I want to feel that they can go on forever.

Well we've moved through the funfair a bit – we've done the rollercoaster, now we're on the ghost train.

Brainy's the new sexy.