Have a coworker who’s annoying you? When they’ve stepped away from their computer for a moment, minimize everything they have open, move their cursor off to the side of their screen, and take a screenshot of their desktop. Save the screenshot and make it their wallpaper. Now move all of their icons around. Your screenshot wallpaper already has all of their icons pictured on it, so now they have two of everything, but only one set works. You could even make a folder on the desktop and hide all of the real icons in it just to be annoying.

For variations on a theme:

• Duplicate the the fake icons in PhotoShop so that there are more than two sets.
• Leave most of the icons in the right place, but hide one or two key icons. Why can’t I open PhotoShop? Everything else works…
• Make a wallpaper for yourself made entirely of overlapping icons. This can be quite annoying to other people using your computer (and you)

Warning: If you are a graphic designer, you will likely be blamed immediately, but these are funny none the less.