Angry customers

Today I dealt with the worst customer I've ever met. He approached me hostile and looking for trouble and looking to trip me up. He set traps for me and then insulted me. His wife stood there with a smug look on her face and let him do it too. I tried to stay calm but I was red in the face and my hands shook uncontrolably. Finally I stood up for myself and put him in his place and he backed down. What a terrible day at work.