Horror films seek to elicit negative emotions from audiences by playing on their fears. They use common settings, characters, themes and conventions to create frightening atmospheres that audiences associate with the genre. Typical elements include isolated locations at night, female protagonists facing killers, unexpected heroes, and themes involving demons, religion, and the struggle between good and evil. Horror films aim to give audiences a thrill by blending real-life and fictional stories of one's worst nightmares coming true.