Deleted Scenes from Star Wars That Explain A Lot: Return of the Jedi

The Emperor: Your son will come to you. His compassion for you will be his undoing. 
Darth Vader: His compassion? But…I cut his hand off. 
The Emperor: He has a pure heart. 
Darth Vader: …
The Emperor: Just like his mother.
Darth Vader: …
The Emperor: Remember her?
Darth Vader: …
The Emperor: And how she died?
Darth Vader: …
The Emperor: Lol, good times. Okay, let’s go torture your son now. 
Darth Vader: …
The Emperor: Force lightning!

(Source: College Humor)