Battito cardiaco is simply the Italian phrase for heartbeat, and this clip is a straightforward sound effect rather than a line from a film, show or song. Heartbeat sounds have long been used in cinema, theatre and video editing to suggest fear, excitement, love or physical exertion, because the rhythm is instantly recognisable to every listener. Online, the same effect is now a staple of short videos, memes, horror edits and dramatic presentations, where a few seconds of steady thumping can turn an ordinary scene into something tense or emotional without any dialogue.