Many of the readers will know of that event, narrated at least in "Absolute Zero Gravity", of the malfunctioning mainframe. One day, as a technician was making diagnostic about why the machine regularly crashed around that time, a janitor entered, saluted politely, unplugged the server, plugged a vacuum cleaner and went on with his routine.

Some of us have personally witnessed cleaning personnel torture equipment, ignoring with force and determination the signals that machines gave while violently stroking the area of the cables.

Oh, and this friend of mine, only days ago, found that a cleaning lady disconnected, to connect some appliance... an incubator. A whole aviary batch - all dead.