Messing with font size and margin for repeated copy pasting into Microsoft Word used to be how I'd crash school computers.
Insomnia as a teen, from the limited number of computers it ensured I could get a nap without looking like I'm slacking. I knew what they were trying to teach anyway so I was making better use of my time.
I also felt like I owed the place a little after my IT(ish) spot was terminated over something that wasn't even my fault.
No halfhearted one liners please. Any retarded faggot can open a terminal and type 'rm -rf /', but we are (supposed to be) sociopaths, so we can do better, amirite?
Post here the best and most subtle ways to screw up an operating system, make it difficult to operate, render it totally inoperable, ruin the user's life, et cetera. Any and all operating systems / platforms.
You may not post eats.exe, Cadaver.
Here's one of my favorites:
On a Mac, you can incite a kernel panic with this command: dtrace -w -n "BEGIN{ panic();}" It requires root of course, but that shouldn't be a problem. You can create a daemon to run on startup and execute this command, and the user will most likely have no idea why their Mac keeps crashing.
"It would be rewarding if they knew it was you who did it."
I disagree. The mystery is more likely to have them tear their hair out over it, while announcing yourself gives them a potential outlet to use to feel better. Having to have it be known who did it strikes me as petty.
"But to randomly fuck with someone's computer then go home and giggle wouldn't do it for me."
That's why you watch from a distance while pretending to be busy.