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WATCH: Your Body On Fear

Ever wonder why you get goosebumps whenever you hear the Jaws theme song?

Turns out, those tiny pimples are an evolutionary defense that we share in common with porcupines, cats, bears, and other creatures that puff up to make themselves look bigger and badder.

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And while goosebumps aren't as useful to us as they are to fur-covered and quill-covered animals, fear and the illusion of fear still set in motion a chain of events from your brain to your skin.

MORE: 16 things that scare the crap out of you


Watch the video above for a simple breakdown of the fascinating process behind your teeny goosebumps.