[smoldesu]

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 the network, and got a fairly thorough talking-to...

[ilyt]

I played with network sniffer on home network (that sent funny packets to switch to make it MITM traffic thru my machine). Except it didn't work/I fucked something up and all traffic went thru my machine.

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

[azinman2]

When I was studying abroad, I noticed that the Ethernet at my Uni dorm seemed to have a lot of cross traffic. So I ran a simple password sniffer, not knowing it also effectively turned my computer into a giant switch. Soon after I came home to my flat mates saying “the IT department came and kicked you off the internet.” I thought it was a joke, until I saw I wasn’t on. I called and pled dumb, saying I had installed an “internet accelerator” and they believed me and restored access.

FWIW I wasn’t actually going to do anything with the passwords (of which I accumulated many!). It was mostly just a fun nerd flex with no bad intentions.