Robots are already doing many things for us. They certainly make great toys. HEXBUG Battle Spiders are fun robots with infrared laser cannons on their shoulders that you can use to fight against a friend. Your opponent will be stunned briefly when hit. You win the battle when you reach 10 hits. All the hits are registered on the head of your robot.
These robots recoil and physically response to shots. The above video shows how they perform. You can get yours for under £40.