What’s the craziest or most outrageous (maybe even NSFW) incident that led to someone being fired from your workplace?

Unhinged entry level employee screaming and swearing and threatening the CFO and spit in her coffee mug.

An email went out to the whole company telling us not to let him in the building before he even got back to his desk to be fired. This is a software company, not exactly the type of place that has armed guards, but the (ex-military) information security dude set up in the area packing for a few weeks after that.