And power cords on servers never come loose while working on a nearby RU (they did not connect or install the redundant PSU due to power/PDU limitations). Or the cheap tang on the RJ45 failed to keep it seated.
And I can't count the number of Server /disk fault lights I've seen that the local techs 'are waiting for the NOC work order'

to do something about.
(I've also worked in some fantastically maintained data centers. I believe those were run by Employees, not contract services)