I just saw Forbidden Zone from 1982.
Bloody hells! Why haven't I seen this before? It was BRILLIANT! It's like a mix between The Residents, 1930s/40s musicals, Squirrel Nut Zippers, old Betty Boop cartoons, just a hint of Terry Gilliam and lots of tits and old fashioned insanity. It was completely surreal, funny and all the musical bits were great. It's been a long time since I laughed this much when watching a movie.
Warmly recommended