The Doctor: These bricks--what are the made of?
Canton Delaware: She ran. Off the 50th floor.
The Doctor: I'd say zero-balance dwarf-star alloy. The densest material in the universe. Nothing gets through that. You're building me the perfect prison. And it still won't be enough.

(emerging from a body bag)
Rory: These things could really do with air holes!
Canton Delaware: Never had a complaint before.

Canton Delaware: What about Dr. Song? She dove off a rooftop.
The Doctor: Don't worry--she does that.

Canton Delaware: How long have they been here?
Amy: That's what we've spent the last three months trying to figure out.
Rory: Not easy if you can't remember anything you discover.
Canton Delaware: How long do you think?
The Doctor: As long as there's been something in the corner of your eye, or creaking in your house, or breathing under your breath, or voices through a wall.

Canton Delaware: Are you armed?
The Silence: This world is ours. We rule it through the will and the fire. We have no need of weapons.
Canton Delaware: Yeah. (shoots it) Welcome to America.

Rory: Amy, can you hear me? We're coming for you. Wherever you are, we're coming, I swear.
The Doctor: She can't hear you. I'm so sorry, it's one-way.
Rory: She can always hear me, Doctor. Always. Wherever she is, she always knows that I'm coming for her, do you understand me? Always.

Rory: Can't you save her?
The Doctor: I can track that signal back, take us right to her.
Rory: Then why haven't you?
The Doctor: Because then what? I find her and what do I do? This isn't an alien invasion, this is their empire. This is kicking the Romans out of Rome.
Rory: Rome fell.
The Doctor: I know. I was there.
Rory: So was I.

The Doctor: Personal question.
Rory: Seriously? You?

The Silence: You are Amy Pond.
Amy: You're ugly. Has anyone mentioned that to you?

The Doctor: Now, stay where you are. Look at me, I'm confident. You want to watch out for me when I'm confident. Oh, and this is my friend, River. Nice hair, clever. Has a new gun, and unlike me, she doesn't really mind shooting people. I shouldn't like that, kind of do a bit.
River Song: Thank you, sweetie.
The Doctor: I know you're team players and everything, but she'll definitely kill at least the first three of you.
River Song: Well, the first seven, easily.
The Doctor: Seven, really?
River Song: Eight for you, honey.
The Doctor: Stop it.
River Song: Make me.
The Doctor: Maybe I will.
Amy: Is this really important flirting, because I feel I should be higher on the list right now.
The Doctor: Yes, right, sorry.

Rory: So what kind of doctor are you?
River Song: Archaeology. (shoots down an alien) Love a tomb.

The Doctor: You can let me fly it.
River Song: Or we could go where we're supposed to.

President Richard Nixon: So we're safe again.
The Doctor: Safe? No, of course you're not safe. There's about a billion other things out there, just waiting to burn your whole world. But, if you want to pretend you're safe just so you can sleep at night, okay. You're safe. But you know, really.

President Richard Nixon: This person you want to marry. Black?
Canton Delaware: Yes.
President Richard Nixon: I know what people think of me, but perhaps I'm a little more liberal...
Canton Delaware: He is.
President Richard Nixon: I think the Moon is far enough for now. Don't you, Mr. Delaware?
Canton Delaware: I figured it might be.

Amy: I traveled with you in this TARDIS for so long. All that time, if I was pregnant for some of it, wouldn't it have had an effect? I don't want to tell Rory the baby might have three heads, or like a time head, or something.
The Doctor: What's a time head?
Amy: I don't know, but what if it had one?
The Doctor: A time head?
Amy: Shut up.

The Doctor: Say 'hi' to David Frost for me, Dickey.

Sir David Frost conducted four paid interviews with Nixon in 1977, several years after the latter's resignation.