This seems like another one I didn't post because of the title -- but then again, it didn't stop me from headling a post "Crumpet-Munching Assholes: The Story Behind Bobby Brown Goes Down.
This is a pretty poor-quality video with pretty poor-quality audio, but looks like one of those rarities that's worth sharing. According to uploader Dave David it's from a 1978 special called Ohne Maulkorb.
(You know, since I mention it, I heard a coworker talking about how great Zappa is today, too. Like I say: starting to dig this place.)