Doctor: The last time, with Martha, it got complicated. And that was all my fault... I just want a mate.

Donna: You just want to mate?

Doctor: I just want 'A' mate!

Donna: You're not mating with me Sunshine!

Doctor: A mate! I want 'A' mate!

Donna: Well, just as well, because I'm not having any of that nonsense! You're just a long streak of nothing, y'know, alien nothing!