SENTIA: I really want to see Omega's universe. We have such plans...

DOCTOR: I'm sure you do. But you can find happiness in this one, you know. It's not a bad old cosmos. Flowers, cups of tea, trees, mugs of tea, sunsets, pots of tea... as you can see, I don't expect too much from this universe...

OMEGA: The price we both paid for our ambitions was exile. Is that what you were going to say Doctor?

DOCTOR: Yes. Yes, I was.

OMEGA: I languished in the heart of a black hole for millennia. What did you have to endure?

DOCTOR: Um. The Brigadier, mostly.

ROBOT: You have been examining it for 2.36 minutes. Logic circuits dictate you wish to buy the book.

DOCTOR: I happen to be browsing!

ROBOT: ‘Browsing’ — that word is not in my database.

DOCTOR: Why did I know you were going to say that...? All right, fine, I’m buying the book. You do take Alpha Centauri express, I take it?

ROBOT: That will do nicely, sir.

(FX: Electronic till sound)

DOCTOR: You, my metal friend, are an electronic mugging machine.

ROBOT Would you like to consider other related titles, sir?

DOCTOR: No, I think ‘electronic mugging machine’ will quite suffice.