The Washington Post has an article on the growing field of dairy robotics. The newest cow milking robots need almost no human assistance and rely on voluntary participation from the cows. Just reading the company web pages will provide some entertainment. Lely calls their product the Astronaut Milking Robot while DeLaval's web site claims they're able to build "cow-friendly" robots because they understand "cow psychology". The Robotic Milking Industry even has its own web site to promote use of milking robots.