Hi ive got another film I can't idetify. It was produced around the same time as flight of the navigator but it isn't that one (so many people have told me it is...) A boy is running through a forest and slips banging his head. At the same time his parents are getting on their baot to go out and set off some fireworks or something. He wakes up 20 years later to find his parents have moved out etc. he gets in contact with them and then he gets put in hospital and has loads of tests because he hasn't aged a day... Wish I could remember more but thats it.