Well, I found a bunch of things here, none of which under that name, but I assume it has to be one of them:
http://www.starwarz.com/starkiller/scripts.htm
Care to help?
I'm beginning to wonder now if Vader didn't actually want Luke to chop him down and become a sith himself. To do so would be to promote the cause of the sith (the most powerful in control). Perhaps he also thought that Luke would be stronger than himself, and would have a chance to plug up Sid's orifices some day in a way that Vader could not. I know it's kinda dumb, but what guy doesn't want to see his son succeed? This would be a good way to give his son a promotion and get out of his own miserable existence as well.