There was a novel where someone showed a "home movie" like that -- Marooned in Real Time, Vernor Vinge. It's not a spoiler, just a cool detail. Alas that the ti

There was a novel where someone showed a "home movie" like that -- Marooned in Real Time, Vernor Vinge. It's not a spoiler, just a cool detail. Alas that the time travel that made it possible went only one way.