Years ago we deployed this system with a SQL DB on a separate windows server.
Every now and then we had error messages saying that the system could not connect to the db. It was going on for about 5 minutes or so and then the db was up again.
We built a bunch of fallback logic to handle it gracefully.
Then one day one of the guys was in the "server room". It was not a real server room but like a dedicated office in another building.
He saw how the cleaning lady came in, unplugged the server's cable from the wall socket and plugged in the vacuum cleaner...