During a 1963 appearance on The Steve Allen Show, on which he generated musical sounds on bicycles, Zappa talked about scoring the soundtrack for The World's Greatest Sinner, which he called "the world's worst movie," even though the general public would not have the opportunity to see the film he was talking about for another 50 years.
During a 1963 appearance on The Steve Allen Show, Zappa created music using bicycles and discussed composing the soundtrack for a movie called "The World's Greatest Sinner," which he considered to be terrible.  This film would not be released until 50 years later.