I've watched this movie at least 20 times by now and never seem to get tired of it. Michael Fox reacts perfectly to the travel back in time scenario. Watch him squirm when he realizes the 1950s girl making eyes at him is his mom-to-be in 1985.Christopher Lloyd is a comic genius whose body language and facial expressions will have you in stitches. As a nutty professor type trying to invent a time travel machine (and succeeding), he is also perfect for this film.The headlong pacing, plus the humorous and inventive situations make this a fun movie for the whole family.