Universal Pictures head Sid Sheinberg did not like the title “Back to the Future”, insisting that nobody would see a movie with “future” in the title. In a memo to Robert Zemeckis, he said that the title should be changed to “Spaceman From Pluto”, tying in with the Marty-as-alien jokes in the film, and also suggested further changes like replacing the “I’m Darth Vader from planet Vulcan” line with “I am a spaceman from Pluto!” Sheinberg was persuaded to change his mind by a response memo from Steven Spielberg, which thanked him for sending a wonderful “joke memo”, and that everyone got a kick out of it. Sheinberg, too proud to admit he was serious, gave in to letting the film retain its title.
(Source: filmtrivia)
