Bill Potts (to 12th): You're an arse. Do you know that? You're a... You're a stupid bloody arse.
First Doctor: If I hear any more language like that from you, young lady, you're in for a jolly good smacked bottom.
Twelfth Doctor: Can we just pretend that that never happened?
Bill Potts: I'm a broad-minded girl - I mean, I know we have this whole professor/student thing going on...
Twelfth Doctor: Can we never, ever talk about this again?
Bill Potts: I hope we talk about it loads. I hope we spend years laughing about it.