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In 2004 author Jon Ronson revealed a military report titled "Non-Lethal Weapons: Terms and References." There were a total of 21 acoustic weapons listed, in various stages of development, including the Infrasound ("Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles...biophysical effects: nausea, loss of bowels, disorientation, vomiting, potential internal organ damage or death may occur. Superior to ultrasound...").
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http://en.wikipedia.org/wiki/Less-lethal_weapon
Eerie sounds probably contain low frequency components below the range of human hearing that cause nausea, loss of bowel control and other symptoms associated with fear and disgust.
 Quote by lisab
I don't think those sounds are inherently creepy, but we've been conditioned by scary movies to associate them with creepiness.
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Scary movies are scary mostly because there is no audio from the scene, only the creepy background music. In real life it would be almost impossible for a monster, homicidal maniac, etc. to sneak up on you in the dark because you would hear him. But in the movies, the victim is always taken completely by surprise when the villain grabs her from behind.
The military has done experiments on sneaking up on sentries and they found that, basically, it doesn't work - even elite soldiers often fail to sneak up on the Gomer Pyle of the outfit. But in the movies all you hear is creepy music and then - gotcha!
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