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If you’ve ever jumped right out of your seat when watching a scary movie, you know that sometimes your body has a reaction to being surprised or frightened. One of our listeners wanted to know why that happens, and we asked neurologist Sarah Benish to help us understand.

Got a startlingly good Moment of Um question for us? Send it to us at BrainsOn.org/contact, and we’ll try to be brave enough to find the answer.