Harry Potter: I have to go back, haven't I?
Professor Albus Dumbledore: Oh, that's up to you.
Harry Potter: I have a choice?
Professor Albus Dumbledore: Oh, yes. We're in King's Cross, you say? I think, if you so desired, you'd be able to board a train.
Harry Potter: And where would it take me?
Professor Albus Dumbledore: On.