The recorded heartbeat is one of the oldest tricks in sound design, because the human brain is wired to react to it. Online, isolated heartbeat clips are passed around soundboards and meme communities as a universal tension tool. They show up in horror edits, Among Us impostor memes, sports highlight reels and prank videos, anywhere a creator wants viewers to feel a moment of danger or anticipation. This particular clip keeps the rhythm natural and unprocessed, which makes it easy to drop into almost any project without it sounding artificial.