George Lucas pitched an ending to Return of the Jedi where Luke helps Vader remove his helmet ... and then puts it on himself. He would've said, "Now I am Vader. Now I will go and kill the [Rebel] fleet, and I will rule the universe."

Co-writer Lawrence Kasdan liked the idea, but in the end, George decided not to make the story that dark. Wow, could you imagine if this actually happened?! Everything would be so different!