I got pranked with this website: https://updatefaker.com/
I recently switched from manual labor to office labour and learned the hard way to lock my screen :)
In hindsight it was hilarious, but I waited for maybe 20 minutes before I got suspicious. How can I take revenge?
Draw something unexpected on it for extra fun. Like dickbutt.
Damn it, this is exactly what I came here to suggest. Ah well, too late now.