Darth Vader: Obi-Wan never told you what happened to your father.

Luke Skywalker: He told me enough. He told me you killed him.

Darth Vader: No. I am your father.

Luke Skywalker: No. No. That’s not true. That’s impossible!

Darth Vader: Search your feelings. You know it to be true.

Luke Skywalker: No! No!

From the movie Star Wars: Episode V – The Empire Strikes Back (1980)