Robots! Cute ones! That dance! Oh, my!
Most of us do not (yet) have access to a 3D printer, but these little Spazzi dancing robots could probably be rigged out of some moldable material and patience. Unless, of course, you do have a Thing-O-Matic, in which case I will be right over, thanks for letting me use yours, you are so, so nice.
The good folks at Make have a full, comprehensive tutorial if you feel compelled to make your own solenoid-powered dancing spazzy thingies. If not, while away the next few seconds on fun little video and write “Thing-O-Matic” on your Christmas list.