A documentary by Henning Lohner. Uploaded by, yes, tomtiddler1.
It's a fascinating look at Zappa and his passions -- the mad scientist/monster movie angle is a good choice; Zappa notes in The Real Frank Zappa Book that his first impression on seeing a picture of Edgard Varèse was that he looked like a mad scientist. Zappa was a mad scientist too -- and really this documentary is devoted primarily to his experimentation with new technology, and his determination to reach perfection unattainable by mere mortals and their human error.
That and just making crazy noises.