I don't fight with my friends often...but when I do...it's like some sort of fight to the death only with words.
My friends and I have done some pretty shitty things to each other during fights, too, including the time that my friend who was my ex girlfriend and I got into it and she said some really harsh things to me and insulted my CURRENT girlfriend, so my girlfriend and I had a cook out at the park and burned pictures of the girl and her daughter, recording the whole thing just to be bitchy. We posted it on youtube and made sure she saw it.
She then broke part of a tea set I'd given her daughter that was sentimental, it was from my great grandmother.
So like I said, not often, but when it happens...
I even have a best friend who when we used to fight, I'd threaten to have CPS take her kids away and she'd threaten to blackmail me to get me fired lol.
We are such drama girls when we're pissed lol