DOCTOR: Oh, I keep thinking, I wish I hadn't done that thing with the salt.

DONNA: What, the bad luck thing? But that was just a lie.

DOCTOR: Normally, except… I invoked a superstition at the edge of the universe, where the walls are thin and all things are possible. I've just got this feeling.

DONNA: What?

DOCTOR: A feeling of something… which is gone. Fine. Good. Onwards.