In the clip below, you can see how a hacked UBTech Robotics Alpha 2 robot stabs a tomato with a screwdriver. Additionally, the security researchers were also able to compromise much more powerful industrial robot arms from Universal Robotics:
This required the hijackers to have access to the same network as the robot (or to be able to physically tamper with it), but being able to control such a bot could have disastrous effects. As IOActive told Bloomberg, Universal Robotics’ creations are powerful enough that, “even running at low speeds, their force is more than sufficient to cause a skull fracture.”
Full details at The Verge.