Heartbeat sounds have long been used in film and online video as a shorthand for fear, excitement and anticipation, and short clips like this one are popular because they are easy to drop into edits without dialogue or music. On short-form platforms, creators pair a steady heartbeat with countdowns, close-ups and jump scares to make viewers feel the moment physically. Its simplicity is part of its staying power: the rhythm is instantly understood across languages and genres, so it continues to appear in suspense edits, reaction videos and dramatic memes years after similar trends fade.