sentence: A man is holding a white shoe and puts it on the ground. sentence: The man already has a shoe on his right foot and it tightens itself when he touches it. sentence: The man's face is shown and he's looking down at the shoes and then it shows the left shoe on the foot and it's tightening itself . sentence:  The man stands up from the car and the scene reveals that it's Michael J Fox in the movie Back to the Future.