I knew a girl I nicknamed mute ninja. Whenever she got a call from some unpleasant customer trying to chew her a new ass over some mistake they made, she would power push her mute button, cuss them out, and return to the line with a solution to their problem. She only did this to people who were nasty to her for no good reason. Sometimes she would outright hang up on people who started out the call threatening and mouthing off at her as though she had been the one to directly wrong them.