Not quite the same . . but nearly.
Many years ago a junior that I was ('mentoring' is over blown) 'looking after' was involved in a project on another site. He had installed a W2K server (if I remember correctly) and UPS but the server wasn't responding to power events.
So we traipsed up there together; I checked the software installation checked the cable, checked the COM port numbers, etc. It all looked okay so I told him to turn the mains power off and see if any events were generated,
He disappeared under the desk and a few seconds later the server, monitor and tape backup all went off!
For some reason, instead of simply flipping the switch on the wall he had chosen to pull the mains lead. From the UPS. That went to the server.
I, somehow, managed to avoid screaming, "What the @#@* are you doing?!!", and instead turned to the customer, watching proceedings with interest, and calmly assured him that with modern file systems, and no-one currently using the server everything would probably be alright.
It was and I had a word with my ward off-site on the way home.