Many years ago we had a cat that was one of several my kids bought home over the years that stuck. We called him Max. The cat was intimidation personafied. Huge, totally black and had fearsome looking fangs that hung outside of his mouth. The cat used to roam around like a panther. One day I took him to the vet and the vet was going to give him a shot. I asked the vet if he wanted me to hold him and the vet said, oh no, I've done this enough times, in kind of a dismissive tone. Max twisted around and locked his teeth on the guys wrist. Didn't bite, just got a hold on. I never saw the color drain out out of a person's face like that. It took a while to coax Max to let the poor guy go.