This is a translation from german but I hope it´s still funny:
I was called for an emergency "whole network down!" Admin-Job. In fact, just one Segment was down, so I startet searching for the reason. It took me 5 Minutes including booting my Workstation to find out that a hub wasn´t responding. So I walked to the assumed location of the hub finding it missing. Asked for this critical bit of Hardware the client said:
"Well, I´ve taken that home for a LAN-Party but it will be back tomorrow morning. Have you found the Networkproblem yet?"