The line comes from Star Wars: Episode V – The Empire Strikes Back, released in 1980, during Vader and Luke Skywalker's duel on Cloud City. Vader says 'No, I am your father' after Luke accuses him of killing his father, though it is often misquoted as 'Luke, I am your father.' The twist was a major cinema spoiler at the time and later became one of the most parodied reveals in pop culture, reused in memes, parodies and edits whenever a hidden connection is dramatically exposed.