When I worked in the south we had a fellow that decided because he got fired by a black woman that everyone was a racist despite there being zero racial tension in the store other than his personal vendetta. He came back and tried to murder the most patently inoffensive skinny white dude in the the parking lot. He throttled him and was yelling he was an ___ lover because he was friendly with everyone. So its 1AM at Walmart and I go charging across the parking lot with zero plan. I ended up getting his attention then backpedaling at which point his victim had fled and he realized there was nothing else to do and ran off himself. I tried to give the cop the shirt that somehow rednecks feel like they need to shed before they "get physical" with someone and got only an offended look in return. They didn't even take a statement.

Same Walmart we had a fellow that was very clearly a recovering addict of some kind who want from hyper religious praise Jeebus to sullen and increasingly angry. He got to the point where he was showing up to get paid but wouldn't do much work and would ride his bike around the backroom. I remember him becoming convinced we were all Satanic because we were talking about a fantasy setting. He told us we need to find Jesus I quiped "Does he provide an experience bonus" Not long after that we had cops monitoring the exit to ensure nobody got murdered on the way out. I'm not sure exactly what he said when they fired him but I understand threats were made.

Same store there was the boss who turned on the electic door motor while I was fixing it causing the little hand crank to go flying across the room like a spear.

Then there was the fellow who would just NOT stop stealing shit like blatantly who was eventually at long last fired for stealing root beer.