Always take a banana to a party.

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.

If you take most men aside when their wives are pregnant, most men are pretty frightened and worried and faintly disgusted by the whole experience.

Do you know how you make someone into a Dalek? Subtract Love, add Anger.

I don't think, generally speaking, people become writers because they were the really good, really cool, attractive kid in class. I'll be honest. This is our revenge for people who were much better looking and more popular than us. I was a bit like that, I suppose.

Never ignore a coincidence. Unless you're busy, in which case, always ignore a coincidence.

The Doctor: 'You know when grown-ups tell you everything's going to be fine, but you really think they're lying to make you feel better?' Amelia: 'Yeah...' The Doctor: 'Everything's going to be fine.