BTW, here's a scene from an early draft of Return of the Jedi. There's an extra character in this version, Jerjerrod, who is assigned by the Emperor to keep Vader away while Luke is converted to the Dark Side. The dialog is clunky, but the line at the end shows Lucas has the ability to come up with quotable lines in him somewhere:
VADER'S PRIVATE CHAMER - STAR DESTROYER
The door to the private chamber slides open, and the Dark Lord of the Sith storms into the room. His voice echoes through the chamber.
VADER
Jerjerrod!
JERJERROD
(V.O.)
it is not necessary to shout, my old friend.
VADER
What is the Emperor doing with my son...
JERJERROD
My lord Vader, the Emperor does not have to answer to you... besides, I don't believe he has your son. Where did you come by this piece of erroneous information?
VADER
He's been seen at the palace... and that's where I'm going!
JERJERROD
The Emperor would prefer you didn't... you would go against his wishes. The Rebel attack is about to begin. You are truly fearless, my old friend.
Vader lifts the Grand Moff by the neck and begins to lift him off the ground with one hand; Jerjerrod gasps for air and struggles to free himself from the Dark Lord's iron grip.
VADER
You are not my friend, bureaucrat. I will go to the palace, but you will not live to see it. I no longer wish to be annoyed by your simpering ways.
JERJERROD
The Emperor will destroy you for this.
Vader snaps the man's neck, and he drops to the floor in a heap.
VADER
I think not... your importance has been greatly exaggerated.