Turned on pc today and a ubuntu wallpaper I had gotten came up I was scared for a min.
was like did I wipe and reinstall in my sleep.
it is a wallpaper of an ubuntu login screen lol.
2 Likes
I remember that trick from years ago - set the wallpaper to a desktop screenshot with an application window and some fake desktop icons, then watch as people try to close a "non-responsive" window and access "non-responsive" shortcuts... 
"This window keeps appearing on boot and I can't close it!" 
3 Likes
Some schools block you from changing the wallpaper for this reason.
But they forgot rightclick on file --> set as wallpaper I think I got at least 5 computers that day. Then they give each student their own chromebook so it did not work.
3 Likes