Icons

One of my favorite computer pranks is to capture a desktop screen, make a wallpaper out of it, and then delete all the icons.
When the user comes back to their workstation, they double-click on the icons on the wallpaper, but nothing happens because they’re not really there.
After a while, they start to panic, clicking and dragging and pounding the keyboard in frustration.
It’s funny to watch. I let them freak out for a while before revealing the prank.
One time, I wasn’t there to reveal the trick, and they slashed their wrists.
I don’t do that prank anymore.