You can, of course, fully fault Ralph Macchio for turning down the role of Marty McFly in 'Back to the Future,' because that guy pretty much went nowhere after bleeding the 'Karate Kid' franchise dry. He thought the movie would be lame because it was only about “a kid, a car and plutonium pills” and the role (after Eric Stoltz was dropped for being too dramatic in his portrayal of Marty) made Michael J. Fox an American sweetheart.