Death whistles are associated with Aztec and other Mesoamerican cultures, where skull-shaped clay instruments were found at burial and temple sites. Historians debate whether they were used in warfare to terrify enemies, in rituals honoring the dead, or both. Modern replicas brought the sound to wider attention through museum demonstrations and viral videos in the 2010s, where its scream startled viewers who expected a simple whistle. It has since become a staple horror sound online, reused in games, edits and reaction videos.