It was my boss' coat.
We had a server that kept shutting down every morning shortly after my boss arrived. Since we weren't allowed in his office none of us could figure out what he might have done to cause the constant FacePlants. Until one morning I'm passing his office with a cuppa & watch him hang up his coat. There's a soft click, his personal ionizer thingy comes on, & I hear the beep of the server going thud.
I asked him to change the outlet it was plugged into, he asked why, I pointed out that the plug on the other side of the wall was the server that wasn't appreciating his ionizer, so he magnimously lets me move the plug. All well & good, right? Not bloody likely.
He comes in the next morning, hangs up his coat, I'm watching out in the hall, & the server goes thud again. WTF? Had he moved the ionizer back? Nope, still on the far wall where I left it. So WTF is causing the problem?
We had to call in a sparky to do his little leccy dance & determine that the boss' coat was essentially a giant static discharge waiting to happen. Which it did every time he hung it up on the coat hook over the switchplate that the ionizer was plugged into. It hadn't been the ionizer, it was his jacket hitting the metal mounting screw, discharging through it, & the unearthed bits taking out the server.
Sparky fixed the grounding issue, the server didn't go thud when the boss came in anymore, but I couldn't figure out how/why such an issue hadn't been found at a much earlier stage - like when the plate had been installed in the first place. FekIfIKnow, not my baliwick, so I'll just be happy that I've convinced the boss to pay for a UPS that can handle the full load of the server & hopefully prevent any further FacePlants...
Fuck me & my wishful thinking.
Dispite being on a different wall, the UPS somehow wound up on the same circuit. The ionizer that had spent months getting zapped by the boss' leccy spewing coat. An ionizer that now played merry hell with the UPS batteries.
I have no idea how, no idea why, nor do I give a flying fuck. I left that job two weeks later when my notice kicked in so I could work for a company closer to home. I was never so glad to cut my commute in half as when leaving that Twilight Zone of a company...