I'm looking for the name of a movie in which the owners of an old cinema teatre tries to save it from being closed, by screening an old favourite. But they are sabotaged and the film has no sound. So they improv the sound and the dialogue from the projector booth over the intercom and make a great success and very funny movie. The screened movie was something to a Mel Brooks film like 'History of the World' or Monty Python movie.