Not too many people can maintain lasting friendships among each other. Some friends just come and go out of our lives, then move on. For stars like Micheal J. Fox and Christopher Lloyd, friendship is forever. There may not be a remake for the Back To The Future movie trilogy but fans can take comfort in the fact that Doc Brown and Marty are besties on and off screen. Fox and Lloyd have been inseparable since their first movie together back in 1985. Now that's a true friendship!