Or the ^@*%#*&@^ cleaning folks that plug vacuum cleaners into UPSes and have me trying to diagnose the "mysterious reoccuring Thursday night server outages".
No, I don't sound bitter, do I?
Moral of the story - don't let anyone near your servers that shouldn't be near your servers. And half of the people who should. My systems run fine with no users. 8)
...you might be eaten by a grue...