From James Cameron's Titanic to Randal Kleiser's Grease, some deleted scenes were best left out of their movies. When filmmakers get going, their creativity takes over, and in the end, the ideas they thought were genius actually don't work at all. For example, at 3 hours and 14 minutes, Titanic's deleted scenes would only make it harder for audiences to sit through the full film, so sacrificing some of Cameron's original ideas was a smart choice.