I used to work in an automotive assembly plant doing IT. Me and a co-worker were out on the plant floor when he mentions a ping tool he found in the office he w

I used to work in an automotive assembly plant doing IT. Me and a co-worker were out on the plant floor when he mentions a ping tool he found in the office he wanted to try out. He plugged it into a network drop and fired off a ping. The whole line stopped shortly afterwards but we hadn't connected the dots. Lot of communication started happening on the radio, apparently all the stations were failing their quality checks. After a couple minutes, the plant manager, head of IT, and other people pulled up to where we were. Co-worker unplugged the device and plant slowly comes back up. Turns out the ping tool was last used years ago to test connectivity to the new quality server and was configured with the static IP of said server. After the ping tool announced itself on the network, the real quality server stopped receiving the quality events so the line stopped.