- Take their computer mouse and turn it over so you can see the bottom of the mouse.
- In the center of the mouse, you will see the trackball that registers the mouses movements, there is a circular piece of plastic that surround this, the "ball cover". Using your fingers, rotate the ball cover until you feel it rotate about 90 degrees. (Depending on the brand of mouse, this could be clockwise or counterclockwise.)
- Pick up the mouse and flip it over into your other hand. The cover and mouse ball should fall out of the mouse. If not, give it a little shake until it comes loose.
- Hide the mouse ball (don't loose it) and replace the ball cover (so your evil work is not as obvious).
- Put their mouse back on their desk and watch them struggle to get their mouse to respond to them.
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