What i get all of the time... two maybe three times a week, daeshavo --or however u spell it-- im not sure where i see it before, but say im out somewhere or with someone ill know that ive seen it before... or that ive lived before. Some say that its ur subconsience reading the future or somehow knowing what will happen. frankly it freaks me out. But on another quote of the pain memory,as kev said its memory. For instance when ur eating u might scratch the membrane in your throat witch u wont remember due to the fact that u didnt feel it, but what happends is later on the membrane remembers it for you and has a reaccuring pain as if soemthing is stuck in your throat, pretty odd but im thinkin it would have the same affect in the dream world.