If you could go back to one particular moment in history, what would it be? Someone (most likely the devil) must have asked Robert Zemeckis that question several times during his career and, in a way, many of his films could be described as different answers. In fact, the films Zemeckis is most well known for — the "Back to the Future" franchise — were a marvelous response to that very question. "Forrest Gump" was also one big riff on the query. Even Tom Hanks silently played it over and over in his mind as he sat on that desert island in "Cast Away," wondering if there was a way he could alter his fate by going back to a pivotal moment or redoing an irrevocable choice.