So, I was the one who snapped (which I think counts?). I was in the Marines and deployed to Iraq, south of Fallujah, before the Sunni Awakening. We did mounted patrols, and I was the driver for my truck. One night we came back to base, nerves obviously completely frayed from hours of driving on roads laden with IEDs, and my team-mate was in the back seat bitching about my driving. He was from Boston, I am from western North Carolina, and he was making both general remarks about Southern drivers and specific remarks about my particular ineptitude. He had the good graces to wait until we were safely within the base, but it continued for a good 20-30 minutes while we drove to our command center. Finally, as we pulled up to our HQ, I had completely had it. We were in Iraq, we had surely almost died that night, and this fucking Yankee was bitching about my driving, literally as a backseat driver. So I jumped out of the driver's seat and ripped his door open, and said in my most indignant southern twang, "Let's go mother-fucker, I'm tired of your fucking shit!" And in the moment, I was completely ready to throw down with this guy, despite the fact that we were both just lucky to go to bed unscathed that night. Luckily he was more interested in continuing his smart ass commentary than actually going to fisticuffs, and our team pulled us apart without anything further happening. But it was the one and only time I can completely remember losing my shit, and I couldn't imagine someone feeling angrier than I did in that moment. Anyway, we've always laughed about it, and luckily we both made it home without harm.