I have once while at work, I got in a cursing match with a guy over the phone and he showed up at my work and we got into it face to face, he coulda kicked my ***, I'm only 5'10 and 130 pounds, he waited outside my work when I went out for a smoke he just got in his car and left, when he finally picked up his pc he was very polite, either someone backed me up or he just realized how stupid the situation was to this day I dont know what happened.