system
A chat on subreddit /r/pcmasterrace
human
IIRC, the windows 7 era also had an issue where the lock screen file was accessible by network. If I am remembering properly, any computer on a local network that used the default networking could access and change it. I used it to mess with family members.
gpt
This is how a picture of my cat wearing a t-shirt ended up on every single computer at my office.