Personally I’ve only ever written two. One that created multiple textfiles in various folders under windows that all grew exponentially. This was in the age of HDD so it could actually caused some serious problems. I created it because a guy in my class stole my homework by copying my files. So i created this virus, named it something fitting and “forgot” to close my laptop when i went to the bathroom.
And another that once every 40 minutes + (5 to 50) minutes would open your cd tray and then close it after 2 seconds. No one used CD’s at this point and i just wanted to prank some colleges.
This was all in school
Wrote a script that runs on startup and creates a service in the background. It just opened the CD drive at random intervals. I think it was every 300–30,000 seconds
Wrote a program, again that runs on startup and creates a service. On a much shorter interval every 15–150 seconds, it jiggles the mouse cursor slightly. Just enough to cause a mis-click
Another program that replaces a full stop keypress with a comma 10% of the time. Really funny for assignments and typing URLs
Another one ejects the floppy drive at random intervals. This one I never released due to data loss risk
Another that kills the monitoring software the school I.T. team uses for watching your screen or preventing you playing flash games
Finally one that makes the computer go BEEP every once in a while
Basically I was just an annoying troll
The school I.T. department got really mad at me and banned me from all computers lol
Holy shit. Calm the fuck down Satan. We got enough problems as it is.