I love this part:
The Doctor: You've swallowed a planet!
Amy: I'm pregnant.
The Doctor: You're huge!
Amy: Yeah, I'm pregnant!
The Doctor: Look at you: when worlds collide!
Amy: Doctor, I'm pregnant.
The Doctor: Oh, look at you both. Five years later, and you haven't changed a bit! Apart from age, and size...
Amy: Oh, it's good to see you, Doctor.
The Doctor: Are you pregnant?
It's funny as hell. XD