We reused an old piece of junk machine as a print server in our development lab, which was connected to the enterprise network. We gave it an appropriately descriptive name, Dungpile.
Little did we know that in its prior life Dungpile had been configured as a DHCP server. (We didn't look at it too closely... our bad.)
One day we hear a frazzled guy from the IT department going door to door crying, "I'm looking for Dungpile! Does anyone know where Dungpile is?"
It turns out the enterprise DHCP server had a hiccup, and in the subsequent negotiation for which backup would take over, Dungpile won out. Our little print server started handing out 10.10.*.* IP addresses (it was evidently set up for a private network) to the enterprise workstations. That worked very poorly.
The IT folks could tell the bogus addresses were coming from a machine called Dungpile, but didn't know where it was located. (I don't know why they didn't just boot Dungpile and force their primary server to resume duties. The weren't a great team.)
Anyway, it made my day hearing someone wandering the hall yelling about finding dungpile.