Watching an old episode of the Muppets about two weeks ago, I positively saw a minimoog on stage with the band. I stopped the show, rewound to the scene, and made everyone in the room look, much to their irritation. :)
My buddy just downloaded all the muppet shows the other day, and I too saw the minimoog make an appearence in a few musical numbers. There's also some pretty rad guest stars like Dizzy Gillespie and Buddy Rich. (I'm pretty sure the Dizzy Gillespie one has a suitcase rhodes in it!)
Feebles was always at the top of my recommendations list when I worked at the media library at my old school. I loved to see the look on people's face when they brought it back (especially the younger advanced highschool students that were going to college). a close second was the G.G. Alin doc. man was he fucked up.