PERI: I don’t think a woolly cardigan would go with this somehow. Anyway, I’m not cold now. I was just remembering when those things were surrounding me. I felt myself getting colder and colder, like they were sucking the energy from me.

DOCTOR: Ah, some kind of exothermic osmotic energy transference.

PERI: Oh, you just can’t help it, can you.

DOCTOR: What?

PERI: Repeating what people say, but in Latin or Greek so it looks like you know more than they do.