"The Real Skywalker Lineage" joke

The Real Skywalker Lineage(Setting: A furious lightsaber duel is underway. Darth Vader is backing Luke Skywalker towards the end of the gantry. A quick move by Vader chops off Luke's hand. It goes spinning off into the ventilation shaft. Luke backs away. He looks around, but realizes there's nowhere to go but straight down....)
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, Luke... 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, C-3PO. I built him - when I was only seven years old.
Luke: No!
Darth Vade: Seven years old! And what have you done? Look at yourself: No lightsaber, no hand, no job and couldn't even levitate your own ship out of the swamp.
Luke: I destroyed the Death Star!
Darth Vader When you were 20! When I was ten, 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 I wanted for my birthday... boo hoo, my daddy's the Dark Lord of the Sith...waahhh wahhh!