The Doctor: Time for a quick adventure, then back for tea.
The Doctor: Yes, that's right, you're going. You've been gone for ages. You're already gone. You're still here. You've just arrived. I haven't even met you yet. It all depends on who you are and how you look at it. Strange business, time.
The Doctor: There are three rules. One: I'm in charge. Two: I'm not the Professor. I'm the Doctor. And the third... Well I'll think of the third by the time we get back to Perivale.