PERI: What's that?

DOCTOR: Comet nine oblique one two oblique four four. To you, Halley's comet.

PERI: It's very pretty, but it still doesn't tell me where we are.

DOCTOR: In your sun's solar system, in the year that you would calculate as 1985. I was, in fact, taking you to Earth.

PERI: Bit of an anticlimax after that journey.

DOCTOR: Ungrateful wretch.

PERI: Well, what do you expect, applause?

DOCTOR: A little gratitude wouldn't irretrievably damage my ego.

PERI: Come off it, Doctor. No one is more surprised than you that we came through it.