Rule 1: The Doctor lies.

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

Never run when you're scared. Rule 7.

Never knowingly be serious. Rule 27.

River Song: Right then. I have questions, but number one is this - what in the name of sanity have you got on your head?
The Doctor: It's a fez. I wear a fez now. Fezzes are cool.

The Doctor: Dr. 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.