Autohotkey script that shuts the system down whenever someone types out certain key words. They of course include words related to looking up the issue like "help", "randomly", "virus" and so on. Not the most sophisticated but one I've actually done before.
Edit: Forgot to mention that ahk needs to be installed and the script must be placed in the autostart folder. Both can be achieved on a coworker's or family member's machine with a ducky usb stick.