ACE: These dayleks-

DOCTOR: Daleks.

ACE: Oh, Daleks, where are they from?

DOCTOR: From Skaro, at least originally. They're the mutated remains of a species called the Kaleds. Left here.

(The Doctor points left)

ACE: When were they left here?

DOCTOR: No, turn left here!

ACE: Oh, right.

DOCTOR: No, left, you missed the turning.

ACE: What turn? Where?

(Ace looks from side to side)

DOCTOR: Why don't you concentrate on where you're going!

ACE: Look I'm doing the best I can, if you don't like it you drive!

(Screen goes dark as they drive under a bridge. When we next see them they've swapped places)