Hah! I did this one at a call center job back in the day, not believing that their sysadmins would possibly leave it open. I was wrong. I did something like "N

Hah! I did this one at a call center job back in the day, not believing that their sysadmins would possibly leave it open. I was wrong. I did something like "NET SEND lol" and it sent out a popup to every workstation on the network. Hundreds of them. Good times.