Ah, Halloween: the one time of year when it’s completely appropriate to scare the fecal matter out of loved ones and friends. If your goal is to make sure children can’t sleep at night, a disturbing urban legend is just the ammunition you need.
Many times directors use color, sets, props AND sounds to subliminally make you fell things. The director of 'The Exorcist', William Friedkin used a sound that some think is scary, but others think is relaxing. You be the judge!