The movie: Alien (1979)

The tagline to Ridley Scott's Alien is often touted as one of the most succintly brilliant in all of cinema history: "In space no one can hear you scream." But just as much thought went into the film's deceptively simple title. Originally written under the title of Star Beast, screenwriter Dan O'Bannon decided to change it when he realized how many times the word "alien" appeared in the script. He and writer Ronald Shusett, who created the story together, both also liked the fact that the word could be interpreted as either an adjective or a noun.