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DIY USB Dongle Pranks Users by Toggling Caps Lock

If you’re looking for a great way to prank your coworkers, this clever and stealthy USB hack randomly toggles the Caps Lock on and off.

The heart of the hack is taking an old USB memory stick and modifying it so that it presents itself to the computer as a keyboard. Once attached to the computer the fake “keyboard” sends the signal to toggle the Caps Lock every few minutes. Unlike software-based pranks your victim can reboot the computer and the fake USB keyboard will mount again and resume toggling the Caps Lock until it is physically discovered and removed from the machine.

Hit up the link below for additional information and schematics.

USB HID Device Prank [via Hack A Day]

Jason Fitzpatrick is warranty-voiding DIYer and all around geek. When he's not documenting mods and hacks he's doing his best to make sure a generation of college students graduate knowing they should put their pants on one leg at a time and go on to greatness, just like Bruce Dickinson. You can follow him on if you'd like.

  • Published 05/4/11

Comments (5)

  1. trinity343

    oh if only i knew enough about the EECT side of computers to do this myself…

  2. ChuckTheGeek

    Only an absolute retard would do something like this. I’m really surprised that you folks actually put this moronic nonsense up on your website.

  3. Thomas

    The best prank remains:

    - Minimizing all windows
    - Taking a screenshot with the entire Desktop including its icons, the taskbar and so on just press PrintScrn)
    - Use mspaint to save that screenshot as JPG or BMP somewhere on the PC
    - Set that screenshot as Desktop background
    - Hide all taskbars
    - Right-click Desktop, go to Properties and hide Desktop icons

    Now the screenshot will look like if it’s the real Desktop, but it is of course not clickable

    Hourse of searching for those who do not know the trick…

  4. BuckTheGeek

    Only an absolute genius would do something like this. I’m really surprised that you folks didn’t put this clever idea on your website sooner.

  5. GuckTheCheek

    This rivals learning how to use multiple firefox profiles simultaneously for, most useful tech tip on this site.

    And here I thought all of my 256MB flash drives were useless.

    <3

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