The Headless Horseman comes from Washington Irving's 1820 story The Legend of Sleepy Hollow, where a headless Hessian soldier is said to ride through the night searching for his lost head. The character became a staple of Halloween through countless retellings, films, cartoons and haunted attractions. Online, this short gallop and neigh clip is reused as a shorthand for that legend, letting creators signal a spooky rider, a haunted road or a classic Halloween chase without showing the character on screen at all.