BILL: Maybe someone's been messing around with time. Like in The Terminator.

DOCTOR: The Terminator?

BILL: It's a movie. You haven't seen it?

DOCTOR: I'm a very busy man.

(He is scanning ahead with the sonic screwdriver.)

BILL: You'd like it. It's got killer robots.

DOCTOR: Ooo, I'll put it on me list.