Police sirens have been a staple sound effect in film, television and video games for decades because the two-tone wail is recognised worldwide as a signal of law enforcement. Online, short siren clips are widely shared on soundboards and in editing libraries, where creators use them as a quick shorthand for pursuit, arrest or sudden trouble. Their brevity makes them easy to drop into memes, pranks and short-form videos, and because the sound needs no context, it still works instantly across languages and cultures today.