Why do some brains enjoy fear

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Across
  1. 3. creature
  2. 7. hard
  3. 8. entertainment
  4. 9. deceased
  5. 11. ride
  6. 12. skeleton
  7. 13. organ
  8. 14. ghoul
  9. 15. literature
  10. 16. Feeling
  11. 17. feeling
  12. 19. spiderman
Down
  1. 1. instinct
  2. 2. hormone
  3. 4. hormone
  4. 5. fear
  5. 6. animal
  6. 10. holiday
  7. 11. dead
  8. 18. house