Observatory - Worm Grunting - A Mystery Solved - NYTimes.com

Observatory - Worm Grunting - A Mystery Solved - NYTimes.com: "Worm grunting, also known as worm fiddling or charming, involves driving a wooden stake into the ground and rubbing the top of it with a leaf spring or other flat piece of steel to make a grunting or snoring noise. Done in the right place under the right conditions, the result will be hundreds earthworms appearing on the surface of the ground."