At least you don't have to sit one office over from him and wonder if the next time you tell him he's batshit crazy that he's going to step out for a marlboro and come back in shooting.
I had to do that once.
He was a moonbat too.
Weird dude. Kept getting weirder. It came to a head one day when the whole office was quiet with everyone working on their projects on AutoCAD and we heard this "Eeeping" sound from one of the cubicles.
I stood up, and everyone was doing the same...
Walked down the corridor, and sure enough, it was Mr. Moonbat bouncing up and down in his chair, making monkey noises. "Eeep....Eeep, Eeeep!"
Myself and another supervisor went into the managing partner's office and closed the door and explained his weirdness and our concerns.
He was fired.
Three of us carried handguns for months expecting him to walk in and start shooting. We had permission & blessings from the owners.
Never heard from him again. Luckily.
Found out after he was fired that he liked to show one of the office girls his pecker in his cubicle too.