DOCTOR: You're doing it again.

CLARA: Doing what?

DOCTOR: The smile.

CLARA: Yeah, I'm smiling.

DOCTOR: It's the sad smile. It's a smile but you're sad. It's confusing. It's like two emotions at once. It's like you're malfunctioning.

QUELL: So, what are you a doctor of?

DOCTOR: Now, there's a question that's never asked often enough. Let's say intestinal parasites.

CLARA: There's a body and there's a mummy. I mean, can you not just get on a train? Did a wizard put a curse on you about mini-breaks?

PERKINS: You know, Doctor, I can't tell if you're a genius or just incredibly arrogant.

DOCTOR: Well, ah, on a good day, I'm both.

DOCTOR: I'm so pleased to finally see you. I'm the Doctor and I will be your victim this evening. Are you my mummy?

DOCTOR: Sometimes the only choices you have are bad ones. But you still have to choose.

CLARA: I know it's scary and difficult, but do you love being the man making the impossible choice?

DOCTOR: Why would I?

CLARA: Because it's what you do, all day, every day.

DOCTOR: It's my life.

CLARA: Doesn't have to be. Is it like-

DOCTOR: Like what?

CLARA: An addiction?

DOCTOR: You can't really tell if something's an addiction till you try and give it up.

CLARA: And you never have.

DOCTOR: Let me know how it goes.

PERKINS: Perkins. Chief Engineer.

DOCTOR: The Doctor. Nosey Parker.