Brigadier: Doctor... come back at once! Come on out, Doctor. Well, that was a short trip. You'll never get that thing working properly.
Oh, you were right about that report, I'm afraid. It wasn't the Master after all.
Jo: He's talking as if we'd never been away.
The Doctor: As far as he's concerned, we haven't. The TARDIS returned to Earth just a few seconds after it left.
Brigadier: What are you two talking about?
The Doctor: Don't try to explain Jo. He'd never understand.