What would it be like to be able to talk to your 12-year-old self? Jeremiah Macdonald did--well, sort of. When he was 12 he made a videotape in which he talked about how it would be fun to talk to his future self. Twenty years later he intercut that tape with footage of himself as an adult to make it seem that it's an actual interview. Very clever and fun to watch (it's about 3 and a half minutes long):
