Goosebumps

Goosebumps appear on our skin when the muscles of our hair follicles contract. When you feel cold, scared or impressed the hair follicles raise causing the hairs to stand up. This rudimentary reflex is beyond our control. Another function is that it scares enemies away, though because we have such little hair it is unlikely that anyone would be scared away. 
Fact: Piloerection, the scientific name for this phenomena happens to 50% of people when they listen to their favorite music. 

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