“LEELA: 'To be, or not to be, that is the question.' That is a very stupid question!THE DOCTOR: It's Shakespeare.LEELA: And that is a very stupid name. You do not shake a spear, you throw it! Throwspeare, now that is a name.”

“It's such a stupid question, in my opinion. I mean, how do you know what you're going to do till you do it? The answer is, you don't. I think I am, but how do I know? I swear it's a stupid question.”

“If there are no stupid questions, then what kind of questions do stupid people ask? Do they get smart just in time to ask questions?”

“Now... Just run.' [said the Doctor.]One of the things you learn very quickly around the Doctor is never to question him when he says that word. You just run. It's almost like breathing.”

“Whether the British ruling class are wicked or merely stupid is one of the most difficult questions of our time, and at certain moments a very important question.”

“River Song: Right then. I have questions, but number one is this - what in the name of sanity have you got on your head? The Doctor: It's a fez. I wear a fez now. Fezzes are cool.”