Crazy idea that could be a movie or book; Imagine this: You have a friend who, for some reason, keeps telling you "I'll be back." whenever he goes somewhere. He's going to the bathroom? "I'll be back." He's going to Burger King? "I'll be back." et cetera. One day, he's going somewhere like the store. He tells you "I'll be back", but he doesn't COME back. About a day or so later, you see a news headline that says "young man killed in tragic car crash" and see his picture. About seventeen years later, some random teenager who looks suspiciously like your friend who died goes up to you and says to you, "Told you I'd be back."