DOCTOR: Some of my goofiest incarnations have been my sliest.

CHARLEY: Oh dear. I hope this isn't going to be like one of those Edgar Allan Poe stories where there's a good twin and an evil twin, and the evil twin–

DOCTOR #1: Don't talk nonsense. This can hardly be good-twin-evil-twin when there are three of us! Clearly I got the brains, that one got the brain damage and you, what did you get?

DOCTOR #2: The manners.