Why do we get 'chills' when we hear nails going down a chalk board?

How come when we hear nails going down a chalk bored or silverware being scraped against plates we get chills down our spine and bodies??





Thanks :) Love Light and Peace :)Why do we get 'chills' when we hear nails going down a chalk board?
i think the its because the sound is too high pitch for our ears to handle.Why do we get 'chills' when we hear nails going down a chalk board?
My chills go mostly to my teeth and my jaw hurts for a second.


is that normal?
Because it is a bone chilling sound.