Curtain opening and closing sounds have long been used in theatre, film and television to mark entrances, exits and scene changes, long before short-form video adopted them. This short version circulates online as a practical effect for creators who need the action understood without showing a real stage. Its link to traditional stage curtains and home drapes makes it readable in any language, so editors reuse it for reveals, endings and pretend performances. The brevity keeps pacing tight, which suits memes, skits and quick transitions.