Why do we enjoy scaring ourselves?

Death Angel,I believe that when we are all faced with something scary or threatening,we all get in to that fight or flight mode and it's caused by the adrenaline in our bodies.I've always enjoyed scary movies since I've been little,people like scary unexplainable things.it's just the thrill of the unknown,,most of us love Halloween and are exposed to this at a very young age and we love to be creeped out,just my opinion,Tomb Raider.