Despite all the insanity being thrown his way in Back to the Future, for the most part, Marty McFly was able to keep a cool head during that first movie, but being called a chicken in the sequels definitely caused some problems that could easily have avoided. Fortunately, by the end of Back to the Future Part III, Marty finally learned not get so worked up about that, as demonstrated by him avoiding the car accident that, in another timeline, was the inciting event that caused his life to go down the drain.
