The line comes from Star Wars: The Empire Strikes Back, released in 1980, when Darth Vader confronts Luke Skywalker during their duel on Cloud City and reveals that he is Luke's father. The twist was kept secret during production, with only a small number of people knowing the true dialogue, which helped it become one of the most famous reveals in film history. Since then it has been quoted, parodied and remixed across television, comedy and social media. The line also circulates in Portuguese as Luke, eu sou seu pai on Brazilian soundboards and meme pages.