DOCTOR: The least important things, sometimes, my dear boy, lead to the greatest discoveries.

(Ian gets the gun)

IAN: All right. Hey, I wonder if it works, hey? (makes rat-a-tat noises)

DOCTOR: Chesterton, this is no time to be playing cowboys and indians.

DOCTOR: (inside the Dalek.) I fooled them all! I am the master!

[Museum]

(The Doctor comes out of the Dalek room still chuckling, and is promptly captured by two Morok guards)

LOBOS: Where have you come from?!

DOCTOR: If you take a look into your screen, perhaps you will find that out?

(walruses swimming)

LOBOS: What are these creatures?

DOCTOR: Just some old friends of mine.

LOBOS: But these are amphibious creatures. You are not an amphibian.

DOCTOR: Oh, I'm not, am I?

(the Doctor dressed in Edwardian bathing costume and straw boater)