Darth Vader:Obi Wan never told you what happened to your father.
Luke: He told me enough! He told me you killed him!
Darth Vader: No... I am your father!
Luke: No, it's not true! It's impossible.
Darth Vader: Search your feelings... you know it to be true...
Luke: NO!
Darth Vader: Yes, it is true... and you know what else? You know That brass droid of yours?
Luke:Threepio?
Darth Vader: Yes... Threepio... I built him... when I was 7 years old...
Luke: No...
Darth Vader: Seven years old! And what have you done? Look at yourself, no hand, no job, and couldn't even levitate your own ship out of the swamp...
Luke: I destroyed your precious Death Star!
Darth Vader: When you were 20! When I was 10, I single-handedly destroyed a Trade Federation Droid Control ship!
Luke: Well, it's not my fault...
Darth Vader: Oh, here we go... "Poor me... my father never gave me what Iwa nted for my birthday... boo hoo, my daddy's the Dark Lord of the Sith...waahhh wahhh!"
Luke: Shut up...
Darth Vader: You're a slacker! By the time I was you're age, I had exterminated the Jedi knights!
Luke: I used to race my T-16 through Beggar's Canyon...
Darth Vader: Oh, for the love of the Emperor... 10 years old, winner of the Boonta Eve Open... Only human to ever fly a Pod Racer... right here baby!

Luke looks down the shaft. Takes a step towards it.

Darth Vader: I was wrong... You're not my kid... I don't know whose you are, but you sure ain't mine...

Luke takes a step off the platform, hesitates, then plunges down the shaft.
Darth Vader looks after him.

Darth Vader:Get a haircut!