Rewatching old (by which I mean first few years of revival) Doctor Who eps and this is still one of my fave moments:

Tenth Doctor: I just want a mate.
Donna: You just want to mate??
Ten: I just want *a* mate!
Donna: You're not mating with me, sunshine!
Ten: *A* mate! I want *a* mate!
Donna: Well, just as well, because I'm not having any of that nonsense!

Three seasons of companions falling in love with the Doctor gets tiresome. This bit is a breath of fresh air. The best Doctor/companion pair.