The waterphone was invented by American artist Richard Waters in the late 1960s and became a staple of horror and science fiction scores, heard in films such as Poltergeist and The Matrix. Its unstable, metallic voice suited scenes where something unseen was present. Online, editors borrowed that familiar film language in shortened meme form, dropping a single swell over TikTok clips, gaming moments, and reaction videos. Because viewers already associate the tone with suspense, a brief hit instantly signals danger or weirdness without needing music, dialogue, or explanation.