Terror of the Autons Episode 3 Screencaps, Part 10

Doctor: Jo, where were you when this thing started moving?
Jo: I was on the telephone.
Doctor: And what about you, Captain Yates?
Yates: I wasn’t here. I’d just gone out to, er, fetch some cocoa.
Doctor: Yes, well something must have….Fetch a tin of what?
Yates: Cocoa.
Doctor: Are you trying to tell me that you were going to make cocoa in
my lab?
Yates: That was the general idea. I’m sorry, Doctor.
Doctor: Yes, well, Sergeant. (pause) Now wait a minute. You didn’t by
any chance use my bunsen burner, did you?
Yates: Well, yes …