Got a call from a customer: “Nothing is working, but only on one desk in the office.”
I poked around a bit, and sure enough, 2 PCs, 2 phones and 1 printer were offline.
Drove out to the customer, looked at the desk and talked to the manager.
Turns out they had run out of ethernet ports after hiring more people.
So instead of calling us, to save money they had bought a desk switch on Amazon and plugged it into a random ethernet port.
Its power chord lay on the floor, unplugged.
When I plugged it in again, the office dog came running, jumped up, pulled it out again and tried to kill it.