We've seen lightsaber-wielding robots before, but those robots were battling each other. Now, a group of Stanford University students have created robots that can battle against humans. As part of a hands-on course in experimental robotics, the class created a robot that can fight with "swords" or "lightsabers" as seen in the Star Wars movies.
I still think we can take them in a fight, though. Look for the power plug.