A guy at work stood up at his cubicle, raised his keyboard over his head with both hands, and yelled "KIMBO SLICE MUTHA FUCKAAA!!!" and smashed it on the cubicle divider 5 or 6 times until it broke in half, then yelled BYAH! (hand motion and everything) and went to the bathroom. Got fired later that day, turns out he wanted to quit but also wanted a nice severance package, so he pulled that stunt.
When I was 14 I worked at a floral business who basically hired anyone. My duty for that day was to stand in one of the greenhouses and shove seeds into little soil pots all day. I was partnered up with this guy probably in his early twenties..typical burn out with the 24/7 confused look who would spend all day telling everyone about how much of a badass he is. My boss was fucking insane. He had an incredibly short temper. His typical reaction to someone doing something wrong would be to throw his hat then break things (including but not limited to plants, chairs, a tow motor once, etc). Anyways, apparently the kid I was working with fucked something up and the boss had just noticed it. He comes storming into the green house red in the face. He starts yelling at the kid for something he had done previously, then begins kicking shit over and eventually telling him to "GET THE FUCK OUT AND DON'T COME BACK..YOU'RE FIRED". Instead of this kid walking out with his head down, he runs up to the boss, rips his shirt off, and yells "IF I CAN DO 100 PUSH-UPS IN ONE MINUTE I KEEP MY JOB". He wasn't asking, he was telling. He drops down and begins doing the fastest push-ups I've ever witnessed. He mumbled his way to 100, put his shirt back on, walked back to the bench, and continued planting seeds like nothing ever happened. Boss never said another word.
Worked as a tech support, front desk, with an ISP. A client told me that any email he sent was always returned to him. I asked him if he knew the mailer deamon error message, he said he didn't know what I was talking about, and proceeded to pull out 2 or 3 envelopes with an email address written on them , completed with a stamp.... facepalm
I work at a Med School and I was in a meeting full of Ph.ds and MDs. Well the meeting got a little heated and one of doctors who was arguing climbed up on the table and started tap dancing while screaming "You can't fire me!! I've been here forever! I can say whatever I want!" It was hilarious.
...................so. whats the craziest thing you have seen at work?