One eerie sound has been haunting Hollywood movies — from Poltergeist to Jurassic Park to Let the Right One In — and 14 seasons of Unsolved Mysteries. ELT tracks down the source of the scary sound.Guests: Rayme Waters, daughter of the spookiest sound in Hollywood’s inventor; percussionist Emil Richards; composer Gary Malkin.Thanks to caller Marianna. Thanks also to Brooks Hubbert, who runs the waterphone business, and musician Lee Charlton.