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April Fool’s is not the only day of the year when you are allowed to pull pranks on your friends. If you are looking for something that will confuse your friends while they use their computers, check out the brilliant prank app called FlyOnDesktop.

prank your friends

FlyOnDesktop is a desktop app for Windows operating systems. The app produces virtual flies on your screen that move about, creating the impression that there really are flies on the monitor’s screen. The app comes in a ZIP archive sized at 650KB and contains an EXE setup file that installs easily.

While the app runs you can access its settings from its System Tray icon; from the settings you can set the default number of flies, keep them on top of all other windows, and launch the app on startup.

desktop flies

Flies can also be added while the program is running. Just right-click on the app’s System Tray icon to add or remove flies.




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  1. Faraz
    June 13, 2011 at 8:41 pm


  2. 2dougmac
    June 11, 2011 at 10:30 pm

    I didn't find that it tried to do anything other than have a fly walk around my desktop, actually 5 of them until I modified the number of flies to 1. It's like the portable app that has penguins marching around your desktop.

    Although it did add a program to the Start menu, and Avast wanted to run it in a sandbox (which I did, just to add that extra edge of caution.)

    Thanks for the diversion, MUO!

  3. Hmorse
    June 11, 2011 at 6:19 pm

    You might add that the program's default installation wants to make itself your default search engine, your homepage, and a couple of other nasty things.