DOCTOR: (drawing a diagram) ...And it comes out here. Right?

OSGOOD: Right. I think.

DOCTOR: Good grief, man, it's as simple as Einstein's special theory of relativity!

BRIGADIER: We'll manage, Doctor.

DOCTOR: Good. When you get that thing finished, bring it through the barrier and down to the village at once, all right? (He drives off.)

BRIGADIER: You know, Sergeant, I sometimes wish I worked in a bank.