This clip is best understood as a general heart beat sound effect rather than a quote tied to one famous source. Sounds like this have long been used in horror trailers, thriller scenes, medical drama moments, and short-form edits to signal fear, stress, anticipation, or intimacy. Online, creators keep using heart beat audio because it instantly tells viewers that a moment matters. Its simplicity makes it easy to loop, sync with cuts, and drop into both serious scenes and ironic reaction edits.