Amelia Pond. Duck Pond.

Amelia Pond, that's like a name from a fairy tale. The Pandorica, that's just a fairy tale. "Aren't we all?", answers River.

No ducks. How do you know it's a duck pond then? Because of the memory of ducks. It is still a duck pond, simply because people remember.

If something is remembered, does that make it so? If the end of the universe swallows the Doctor whole, would he survive if Amy remembered him?

You're a time traveller now, you see things differently. "The Doctor in the TARDIS doesn't know." He sees things that others can't, he percieves changes that aren't supposed to happen. "I'm missing something." What if there are things he can't see, because he sees things differently?

EDIT:

River Song. That's also like a name in a fairy tale.

Is the crack following Amy?