Flashbacks, I've heard somewhere that it's how our mind says 'you've already been thru this'. But the mind works in mysterious ways, and mystery in itself is something we just don't quite understand yet, but that we could do... eventually. Will it still remain a mystery when we do, I wonder.
Alas, wandering soul, I suppose you're not here to listen to a man's ramblings of philosophical nature. I don't suppose you can make up what brings you here from amongst the blurriness of your mind?