Don't play games with me! You just killed someone I like, that is not a safe place to stand! I'm the Doctor, and you're in the biggest library in the Universe. Look me up.

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: Don't blink. Don't even blink. Blink and you're dead. Don't turn your back. Don't look away. And don't blink.

People assume that time is a strict progression of cause to effect, but *actually* from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... time-y wimey... stuff.

Brainy's the new sexy.

I can't see what's wrong about assuming intelligence in your audience and what's bad news about being rewarded for assuming that.

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