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In the middle of math class and bored out of your mind well if you have a pen and a rubber band you could make class interesting....
All you need is a pen and a rubber band.
Take the rubber band and stretch it between your thumb and middle finger.
Put the pen cap through the rubber band and pull it back.
Now let go of the string but make sure you don't hit your fingers! The pen should go flying but if it didn't try again or go through the steps again.
Just to say this is my first Instructable so please don't critisize it!
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