To follow Asimov's rules of robotics, one must break them.

A robotics research team from Slovenia wants to establish how robots should move when around humans in order not to hurt them. The first step in this study was having an industrial robot arm hurt humans (yes, they got human subject permission for that). The study aims to establish how fast robots can approach humans without causing them pain.

Robot arm punches human to obey Asimov's rules - tech - 13 October 2010 - New Scientist