I had to resurrect this hilarious thread.
Admittedly, these are not as awesome as the others here, but I found a couple weird ones on a recent public museum trip.
Also, I recently toured another strange museum in Wisconsin that had this gigantic pneumatic orchestra machine played by mannequins. It was built over half a century ago, so they're all falling apart, and I don't even think they were ever really intended to be seen real close. It was so dark that we couldn't tell how awful they were without some good flash pictures. They were grotesque... (spoiler)