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Last but not least on my comprehensive list of pranks is an application that simulates a Windows Vista upgrade (albeit a fast one) which ultimately dumps the user to an OS X desktop just before letting them know they were pranked. Here are the deets:
1 - Download Vista Upgrade Prank straight from the developer's page.
2 - Open the zip file and extract vista.exe to the Startup folder like so:
3 - Click the Start button
4 - Click "All Programs"
5 - Scroll down to "Startup," right-click it, then select "Open."
6 - Click and drag vista.exe into the Startup folder.
You can couple this app with the shutdown shortcut, or maybe set it up for the next day they come in and boot up. There are plenty of options! And now, since you've made it this far, onward to a couple of bonus pranks!
[Related Gallery: 20 of the coolest gadgets and must-haves for your office!]