It appears that science has stumbled across the reason for it. It has nothing to do with the supernatural, but the answer is almost as weird.
In order to understand the science we need to head back to the late 1950's. While working in his robotics laboratory Vladimir Gavreau noticed that one of his assistants was bleeding from the ears, despite the absence of rebelling robots choking him.
Puzzled, Gavreau started researching the phenomenon by holding vibrating pipes next to clueless assistants. We'll never know what excuse he used when they turned around and asked him why their ears were bleeding, but one way or another Gavreau soon realized that a vibrating pipe of the right length and girth can cause a number of unpleasant effects ranging from mild irritation to serious pain.