If you want to play a trick on your office mates, one of the best ways to do it is by flipping the display on their computer. Many people do not realize that it is possible to flip the computer display sideways or upside down, but in fact it is quite easy. If you have a Dell PC or a Dell monitor, you can flip the display with just a few clicks of the keyboard.
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Go to the computer and hold down the "Ctrl" and "Alt" keys down at the same time. Then press the arrow keys on your keyboard. Pressing the down arrow will flip the display upside down, while pressing the right and left arrows will flip the display on its side.
Hold the "Ctrl" and "Alt" keys down at the same time and press the up arrow key. This will flip the screen back to its original configuration.
Right-click on the desktop and choose "Properties" if the above step does not work. Click the tab for your graphics card, locate the "Rotation" setting and set it back to 0 degrees.