The Doctor and Rose in “The End of the World”

You think it'll last forever: people and cars and concrete. But it won't. One day, it's all gone. Even the sky. [long pause] My planet's gone. It's dead. It burned, like the Earth. It's just rocks and dust. Before its time.

What happened?

There was a war, and we lost.

A war with who? [The Doctor doesn't answer, seemingly lost in thought.] What about your people?

I'm a Time Lord. I'm the last of the Time Lords. They're all gone. I'm the only survivor. I'm left traveling on my own, 'cos there's no one else.

There's me.

You've seen how dangerous it is — do you want to go home?

I don't know... I want... Oh, can you smell chips?

Yeah. [laughs] Yeah!

I want chips.

Me too.

Right then, before you get me back in that box, chips it is. And you can pay.

[pats down his pockets] No money.

[laughs slightly] What sort of date are you? Come on, then, tight wad, chips are on me... we've only got five billion years 'til the shops close!