Nancy: How’d you follow me here?

Doctor: I’m good at following, me. I’ve got the nose for it.

Nancy: People can’t usually follow me if I don’t want them to.

Doctor: My nose has special powers.

Nancy: Yeah? Is that why it’s so…

Doctor: What?

Nancy: Nothing.

Doctor: What?

Nancy: Nothing. Your ears have special powers, too?

Doctor: What are you trying to say?

Nancy: Good night, mister.

From Doctor Who – Season 1 Episode 9: ‘The Empty Child’ (1×09)