I had a semi serious verbal confrontation with a hippie type with a pit bull at our local dog park. Place is full of little Terriers, Poodles and the like. STUDLY was about to set loose a 95 pound pit that was showing serious behavior issues and which he said had been fought and the massive scars on his head were the proof to me that he was serious. I quietly informed said Hippie that I would cut his arm off if that monster killed my Terrier. He said "you are outa yer fxxxing mind you old fuxx". I replied "That is my point. You think you are the only lunatic running around loose out here and that isn't true". Guess he believed me. He left abruptly with Sudden Death or Blood Bath or whatever he called that thing and half the people present put down their dogs to continue play. The other half stopped chasing theirs and trying to save them. That guy had a 12 inch hunting knife on his belt. Yeah, pass the word....gunpowder isn't the only thing that gets unstable with age.
I love that. Years ago I was in Chicago for a trade show. A couple of others and I were were walking between clubs one evening. A young punk approached us with a knife and talking crap. I had eye contact with him and told him that I had killed so many times for my country that I wouldn't mind killing him and that he could walk away and live, approach and die. He postured for another moment, then got more nervous and walked away cursing something about crazy people.
Fortunately it worked. But I wouldn't recommend this approach to anyone. I had been to a club and had a few drinks. Otherwise, I probably wouldn't have tempted fate like that. But, sometimes crazy does work. Unfortunately, when it doesn't your screwed.