DOCTOR: That's calmed her down a bit. She's very temperamental when she's roused, isn't she.

JO: You know, I never know whether you're joking or not, I, Ow. Oh, I think I've bruised my tailbone.

DOCTOR: Sorry about your coccyx, Jo, but these little things are sent to try us.

JO: My what?

DOCTOR: Coccyx. Your tailbone.

MASTER [on scanner]: I'm sorry about your coccyx too, Miss Grant. How very sociable of you both to drop in.