Oh god, Net Send.

At one point it was my job to track down and upgrade old PCs that had been moved by users. To my delight, I found that Net Send was enabled on all the org’s devices. I had the bright idea to use it to pop up a message on the affected PCs asking them to call me and provide a location. I copied a script from an old website and modified it to work with a list of hostnames. It, uh, worked - but while I was testing my script I ran it without commenting out the line that sent the message to all devices on the subdomain.

I turned my phone off for the rest of the day.