Rewrite an ending!

This a very simple, but very possibly enjoyable, writing exercise. Students can pick out a story from any previous class or even in the current class for the writing in which they did not enjoy a particular ending. They could even pick out a film if no literature comes to mind, and they can rewrite the ending. I know as a kid I would always read books or watch movies and dislike the ending. This creates a way for students to not only be creative, but make an ending they find more enjoyable as well.