Deja vu is a memory of a future event. One that hasn't occurred yet. If you're wondering how we can remember something that has yet to happen, the explanation is simple. There is no free will. It is just an illusion. We are characters in a movie. We think that we are making choices, but in fact everything has already been laid out. The future is predetermined.

That was in the Matrix ?? Strange. I don't remember that. But I've only watched the first one. Don't remember it ended like that. Maybe it was in part 2 or 3, and that was my memory of what I will see when I watch them in the future?

Actual observational proof of the hypothesis.

The spanner-in-the-works here is the expansion of the universe is accelerating rather than being slowed down by gravity. So there would likely be no big crunch. Hell will freeze over though. Or at least the universe does.

http://en.wikipedia.org/wiki/Big_Freeze