I remember on the Macs they had this fake desktop thing where you could only access like ten programs and nothing else, but we found out this keystroke that brought up the admin password prompt and the password was the name of the school (for the teachers and staff obviously) and you got full access to the entire computer from it.
Was totally like WarGames.
Oh man, I remember that thing, it was called Finder. I eventually found out the password to get into the main system just by looking at other teachers typing it in, but before that I found a more unusual method. Apparently there was a bug where if you just keymashed at the password prompt, eventually you would be able to get in, I just found out one day when I was bored. We were all pretty shocked and didn't know what to do, one of my friends suggested that we put the Finder program in the trash bin. Apparently that was a bad idea since the computer would be down for maintenance indefinitely, although after a few months they just replaced it with a new one that was more powerful, so I guess it kind of worked out in the end. Looking back, I'm kind of surprised that we never got in trouble for it, guess my friends knew how to keep secrets.
When I did find out the legit password, I used to brag that I found a way to hack through the prompt and would do some absurd key sequences for show while typing in the real password. I once mentioned it to a teacher who didn't believe me and told me to show her, I did it and she became absolutely mortified and told me to never do that again or I could get in serious trouble. Haha, the good old days of "hacking". I also used to go in the school computer lab during my free periods and type random ALT+numpad sequances in Word, I would usually open a normal computer file which showed a bunch of garbage on the screen, and just type in random characters. The teachers would always looke really worried and ask what I was doing, I just said that I was programming.