The lines come from J. R. R. Tolkien's The Fellowship of the Ring, where they are sung by a Barrow-wight in the Barrow-downs as Frodo and his companions are trapped in an ancient tomb. The chant has long been quoted by Tolkien readers for its bleak, wintry menace, and audio readings and dramatic retellings have carried it onto short-form video, where its short, rhythmic wording works well as a standalone sound. It remains popular because it instantly signals danger, cold and the supernatural without needing any explanation.