My 8 year old son thinks that he's from the future. should i try to convince him that he isn't?

That is SOOOO weird. Maybe he is right, because my son has said the same thing--AND HE IS 7! I have been trying to tell him that he isn't really from the future, and sometimes he cried and begs me to believe him. Once he said, "What lies ahead, Mommy, is not what you would possibly know." And it was weird, because you could tell he was serious. About an hour later my boyfriend and I found ourselves in a car accident, not so serious, but the other guy got killed. But we only had minor injuries. It was REALLY weird.