Sycorax: I demand to know who you are!

Doctor: I don't know! See, that's the thing, I'm the Doctor but beyond that, I just don't know. I literally do not know who I am. It's all untested. Am I funny? Am I sarcastic? Sexy? (winks at Rose) A right old misery? Life and soul? Right-handed, left-handed, a gambler, a fighter, a coward, a traitor, a liar, a nervous wreck? I mean, judging by the evidence, I've certainly got a gob. And how am I gonna react when I see this? A great big threatening button. A great big threatening button which must not be pressed under any circumstances.