I have worked for several bosses that would go into tirades, act childish, scream, and threaten. etc.
But my worst boss, I never talk about, except to fellow ex-coworkers from that company.
The guy, I believe, was a true sociopath. Never totally lost his temper, rarely raised his voice much, likeable at first glance, very intelligent, but deadly.
Think "Hannabil Lecter", but he didn't physically eat people. Nevertheless, after several years, people left and felt like a piece of themselves was gone.
The guy started as an engineer at a small company. Became a part owner (very small part owner) of the company that was majority-owned by a private corporation. Forced another small-part owner out acquiring his portion at less-than-value. Help leverage the sale of the company to another corporation with big poison-pill contract while making money for his share. So badly performed that the poison pill was executed and he walked away with more money. Used his away-time from the company to turn-it-in for the taxes that were not paid (while he was running it) that caused the new owners to pay. Then turned-around with another partner and re-bought the company at a loss to the new owners a few years later (now that the tax history was cleared-up). Eventually forced the new partner out and fully owns the small company.
I will not go into incidents while working for him - they're just hard to communicate to an audience that has never experienced such a person. We were always surprised how like a cat "he could always land on his feet". But under him was always a stack of bodies.
I can't watch "Silence of the Lams" without thinking of this old boss. The actor Anthony Hopkins captures the personality type so well. There are simple things in the movie that unless you've met and known this kind of person, you just might not pick up on.