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I once witnessed a robot kill someone.

I was a kid. A killer, fresh from murdering his parents and several others, came to our neighborhood looking for a hideout. He broke into the home of an elderly couple two doors down and held them hostage. They managed to escape, but the killer was still in the house, armed with a rifle. Those of us in the surrounding homes were ordered by police to remain there lest we be shot taking out the trash or walking to a car. But we couldn't stay inside forever, so the SWAT team that was using my parents' kitchen as a base of operations came up with a plan. A few hours later, a tiny little car the size of those small mail-delivery trucks pulled up. The doors opened and out came…what looked like Johnny Five.

I was a bit upset. This robot was adorable and they were going to send him inside to get blasted away by a crazed killer. Not so. The robot inched along the street, then up the path to the house. It opened the locked door with ease and proceeded to follow and film the killer. He shot at it. It kept going. He went upstairs to escape it. It climbed up right behind him. He shot at it again. This scenario repeated for hours until he eventually went even crazier than he had already been and, unable to shake or destroy the robot, shot himself. We were free.

Now in some ways I owe that robot my life. In other ways, it taught me that robots should maybe make me fear for it. The robots you're about to see are all designed to help people. Some of them are even quite cute. But make no mistake; it given the chance, they will kill you.