Closest I ever got to this...
...was getting sent to handle an irate conference guest who insisted that despite what they had been told, there was no internet socket in their room (These being the days before ubiquitous wifi.) The socket in question was in fact on the wall just above and behind the desk, right next to the power socket they had left their laptop charger plugged into.
Since the person in question wasn't there when I showed up, my response was to use yellow electrical tape to put an extremely large arrow on the wall pointing to it.
Biting the hand that feeds IT
