DOCTOR: Venezia. La Serenissima. Impossible city. Preposterous city. Founded by refugees running from Attila the Hun. It was just a collection of little wooden huts in the middle of the marsh, but became one of the most powerful cities in the world. Constantly being invaded, constantly flooding, constantly just beautiful. Ah, you got to love Venice. So many people did. Byron, Napoleon, Casanova. Ooh, that reminds me. 1580. That's all right. Casanova doesn't get born for a hundred and forty five years. Don't want to run into him. I owe him a chicken.

RORY: You owe Casanova a chicken?

DOCTOR: Long story. We had a bet.