I didn't see Jacobi/the watch thing coming, and I may have done a sex wee in my pants at that point.

This is, if anyone's keeping count, a really bloody clever way to resolve the opening scene of 'Dalek' when the Doctor says he'd know if there were any Time Lords left. I'm almost willing to forgive 'Boomtown' and the crapness that was the 'Bad Wolf' arc just on how this episode pulled together various strands. It was, for a show from which I have no expectation of subtlety, really quite nicely done.