Earlier quoted context omitted.
https://everything2.com/title/Jordan+K.+Hubbard > Long before FreeBSD, Jordan K. Hubbard earned a spot in Internet history in 1987 when he accidentally attempted to broadcast an rwall message to every machine on the Internet. He stopped it once he realized what was happening, but not before he & the other UC Berkeley network administrators were flooded with complaints.
Got in trouble for something similar in middle school, actually. I would bike over to the high school for my robotics club, and some of the older members had written a privilege escalation script for the Windows machines. So, I brought it on a flash drive to my technology class the next day and ran 'shutdown -i' with admin privs. Being young and stupid, I broadcast a reboot message to all ~700 machines connected on t…
They couldn't prove it's me so teacher just blanked banned anyone in the library (our class with few of my friends were on the 4 machines in the library) from using machines there for few months.
Then when we got new shiny machines for computer lab I was bored when the teacher was explaining something so I started guessing admin password. It was zaqwsx