I always wondered what if Robert Towne had rewritten parts of The Empire Strikes Back:
Skywalker, crawling away from Darth Vader, Vader following. "Obi-Wan never told you what happened to your father," Vader tells him.
"He told me enough!" Luke shrieks. "He told me you killed him!"
"No. I am your father."
Skywalker takes his lightsaber and whips it across Vader's mask with a loud CLANG!
Vader is stunned. In a shaky voice, he says: "I am your brother."
CLANG! Skywalker saber-whips him again.
"Your father, your brother..."
"Your father and your brother!"
Luke's arm stops, frozen; Vader, faceplate dented and near tears, looks at him. "Your sister Leia and I...understand? Or is it too tough for you?"