The wailing police siren is one of the most recognizable emergency vehicle sounds, used for decades by police cars in the United States and copied in films, games and cartoons worldwide. Online, the loud version became a staple soundboard clip because creators rely on its instant meaning: flashing lights, a chase, or a joke arrest, without needing any explanation. It is frequently paired with other sudden meme hits like the vine boom sound for extra impact in short edits.