Flip Webpage upside down in Chrome [PC prank]

Do you want to play [very harmless] PC prank on friends? You can flip any webpage upside down in Google Chrome browser and amaze friends while they try to browse favorite websites (all appearing upside down). This is possible by using "Upside Down" Chrome extension to flip whole webpage or

Windows Fun by showing joke, pranky error messages

We have already seen cool way to create fake and funny error message boxes. Well, checkout Dr Windows that can save you from dying of humor - does it? On the face of it, this program will behave as if it is protecting your computer from something (not sure what). This will actually