River: You know when you see a photograph of someone you know, but it’s from years before you knew them. It’s like they’re not quite finished; they’re not done yet. Well, yes, the Doctor’s here. He came when I called just like he always does, but not “my” Doctor. Now, my Doctor, I’ve seen whole armies turn and run away, and he’d just swagger off back to his TARDIS and open the doors with a snap of his fingers. The Doctor in the TARDIS. Next stop: everywhere.
The Doctor: Spoilers! Nobody can open the TARDIS by snapping their fingers. It doesn’t work like that.
River: It does for the Doctor.
The Doctor: I am the Doctor.
River: Yeah. Someday.
— — River Song, Silence in the Library