If you have ever heard a metallic, screeching sound in a horror movie, you were likely hearing the Waterphone. Invented by Richard Waters in the 1960s, this instrument consists of a stainless steel resonator bowl with various lengths of bronze rods around the rim. It is partially filled with water, and the musician bows the rods. As the water moves inside, it creates an eerie, shifting echo. It has been used in countless legendary films, from 'Poltergeist' and 'The Matrix' to 'Let the Right One In.' Because its sound is so unsettling and difficult to pin down, it became the 'go-to' instrument for suspense and the supernatural. It is a rare example of a 20th-century instrument that has become as much of a 'horror legend' as the actors it accompanies on screen.