Scientists have discovered a real-life "moral compass" in the brain that controls how we judge other people's behavior. The region, which lies just behind the right ear, becomes more active when we think about other people's misdemeanor or good work.   In an experiment, researchers were able to use powerful magnets   to disrupt   this area of the brain and make people temporarily less moral. The study discovers that our sense of right and wrong isn't just based on upbringing, religion or philosophy --but also by the biology of our brains. The researchers used a non-harmful technique to disrupt the area of the brain. The technique produce a magnetic field on a small part of the brain which creates weak electric currents in the brain. These currents interfere with nearby brain cells and prevent them from firing normally. One story described a man who let his girlfriend walk over a bridge he knew was unsafe. The girl survived unharmed. Under normal conditions, most people rate the man's behavior as unacceptable. But after getting the magnetic pulse, the volunteers tended to see nothing wrong with his action --and judged his behavior purely on whether his girlfriend survived. Another story described two girls visiting a chemical plant where one girl asks her friend to put sugar in her coffee. The friend uses powder from a jar marked toxic   -- but as the powder turns out to be sugar. Volunteers with a disrupted moral compass tended to rate the girl's behavior as permissible because her friend was not injured--even though she was aware the powder came from a jar labeled toxic. Throughout the experiment, irresponsible or deliberate  actions that might have resulted in harm were seen as morally acceptable if the story had a "happy ending". What do the two stories want to tell us?
People who like playing jokes on others is controlled by "moral compass". People judge others' behavior acceptable or not by the "moral compass". whether people's behavior is acceptable or not is judged by a happy ending. Different behaviors controlled by the "moral compass" are all acceptable.