You're bluffing! There isn't a sincere bone in your body, there isn't a bone in your body.

The writing... the graffiti: Old High Gallifreyan.
The lost language of the Time Lords. There were days, there were many days, where these words could burn stars, raise up empires, and topple gods.

Yeah? Well, it's boring now, isn't it? They're boring-ers! They're blue... boring-ers!

Didn't anyone ever tell you? There's one thing you never put in a trap, if you're smart. If you value your continued existence, if you have any plans about seeing tomorrow, there's one thing you never, ever put in a trap. Me.

Rory! That's a relief! I thought I had burst out of the wrong cake. Again. That reminds me, there's a girl standing outside in a bikini. Can someone let her in, give her a jumper? Lucy. Lovely girl. Diabetic. Now then, Rory, we need to talk about your fiancée. She tried to kiss me. Tell you what though, you're a lucky man; she's a great kisser! ...Funny how you can say something in your head and it sounds fine.

I like the bit when someone says "It's bigger on the inside!" I always look forward to that.

This is bad, I don't like this. Never use force, you just embarrass yourself. Unless you're cross, in which case... always use force!

Oh, look, a big mining thing. Oh, I love a big mining thing. See? Way better than Rio. Rio doesn't have a big mining thing.

Okay... this piece of dialogue is just epic, and it makes for one of the best cliffhangers ever!!