Police sirens have used alternating wail and yelp patterns for decades to clear traffic and warn people nearby, with the slower wail carrying across distance and the faster tones grabbing attention up close. Recordings of that sound became a stock effect in films, games and news edits, then moved to soundboards and short video memes. Creators reuse this looping version because everyone recognises it instantly without any context, making it useful for chase jokes, roleplay scenes, toy vehicle videos and mock emergency situations online today.