Dementors are dark, hooded creatures from the Harry Potter series, first introduced in The Prisoner of Azkaban, where they guard the wizard prison of Azkaban and drain happiness from those near them. In the films their arrival is marked by cold air, silence and a rasping, whispering sound that has become shorthand for dread itself. Fans and editors have lifted that audio for memes, fan edits and spooky compilations, using it whenever a scene needs instant menace without explanation. Its recognisable Harry Potter connection keeps it popular long after the films.