In One Piece, Transponder Snails, called Den Den Mushi, function as the world's telephones and video transmitters, mimicking the person speaking through their expressions. The purupuru purupuru ringtone became one of the series' most familiar audio cues because calls often deliver orders, warnings or major plot news. As One Piece clips spread on soundboards and in fan edits, the short ring and pick up was isolated for reuse, and it remains popular because any fan instantly understands a call is about to change the scene.