for several days in a row i’d get to class before the bell. the teacher would hang out in the halls.
i’d hop on his unlocked PC, open command prompt, run shutdown /r /t 600, minimize the prompt, and walk away.
he’d be mid attendance and his computer would reboot on him. a few days in he stepped into the room mid me typing the command. he was madder than i expected, but just “yelled” at me.