I had one guy at a show get on my about my height. This is a rough approximation of that exchange.
"Hah you ain't even six foot! Freakin midget man!"
"Yeah but I could kill you with your own leg then fuck your girlfriend without even bothering to wash the blood off."
"You're fucked up man!"
"And you're apparently a little wimp, and isn't that all that matters in the end? Now beat it before I saw you off at the ankles"
He left. Pretty sure I laid him out in the mosh pit later, but I can't be sure, punch one skinny asshole in leather pants with a mohawk in the temple you've punched them all.