Do you like to prank your friends and family? Give this little contraption a go. It’s the perfect thing to make someone jump, without causing any harm.
If you want the contraption to be even more annoying, you can slip a strip of paper through the keyring. Cut the paper just the right length that it hits the wire every time the keyring spins around, and it’ll make a loud buzzing noise!
This annoying little machine is pretty simple, but it’s sure to shock your friends and family.
Energy is stored in the twisted rubber band, but it can’t release when it’s under something heavy. As soon as the book is lifted, the rubber band starts to unwind, spinning the ring. When the ring taps the table, the contraption jumps up into the air.
If you’ve added a paper strip, it makes a tapping sound every time the paper hits the wire. But it’s happening really fast, much faster than you can count. At a certain speed, you can’t perceive the individual taps and instead hear something closer to a note. Faster and faster taps will produce higher and higher notes.
Finally, did you know the startle reflex is one of the fastest reactions humans have? It can take less than 40 milliseconds for someone to start blinking, and 100 milliseconds to move their head and shoulders. At the same time, adrenaline and other hormones are dumped into their bloodstream, dilating their pupils and raising their heart rate. In a brief moment they’re ready to flee, or fight!
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