This is a general heartbeat sound effect rather than a quote tied to a specific character or scene. Sounds like this have been used for years across film, horror trailers, games and short-form edits to signal fear, panic or anticipation. Online, creators reuse heartbeat audio in reaction clips, countdown moments and suspense memes because the meaning is instantly understood. It remains popular because a simple pulse can change the mood of a scene quickly, even when very little is happening on screen.