WiiBot is the pet project of two engineers who apparently have way too much cool hardware and time on their hands. These two guys figure that as long as you have a Kuka KR16 industrial robot to work with, why not see if you can control it with the Wii Remote? The result is a tennis-playing, sword-wielding mechanical arm that simultaneously captures 'weekend of nerdy fun' and 'accident waiting to happen' in a fun two minute video. The website even details the technical aspects of teaching a robot to parry.