Many of us have seen at least one movie that uses the device of a lone wolf's howl in the not-too-distant distance to raise the hair on the back of the protagonist's neck and the necks of everyone in the audience. The howl of a wolf is a chilling sound, indeed. But how about the sound of 30 wolves howling at once, as in this video? At first, it's just the one, but it starts a chain reaction that takes over the whole pack at a wolf sanctuary. This'll raise the hairs not just on the back of your neck, but everywhere else, too.