The line comes from Star Wars: The Empire Strikes Back, released in 1980, during the duel on Cloud City when Darth Vader tells Luke Skywalker that he is his father. The twist shocked cinema audiences and became one of the most quoted moments in film history, often misremembered with Luke's name added at the start. It spread through parodies, commercials and internet memes, and creators still use the short audio clip today because the reveal needs no explanation.