As Hackaday observed, I wish I had an industrial robot to play with. A couple of robotic engineers linked the Wii controller up to a robot arm with a fast response time, and quickly had it playing tennis or swordfighting. The motions are basically canned and matched to a set of prerecorded swings, but they explain how it could be converted to a more real-time system.
I wonder what the price tag on one of those arms would be? Not even just for this. I'd train it to spray water at the cat.