Heartbeat sounds have long been used in film, television and games to signal fear, suspense or strong emotion, because the rhythm is instantly recognisable to almost everyone. Online, short heartbeat clips became a staple of video editing, reused in horror edits, reaction videos, romantic montages and prank setups where a creator wants tension without dialogue. Their simplicity keeps them useful: a two-second pulse can be looped, layered or timed to a cut, making it a reliable tool for creators working across many different genres and platforms.