The police brr brrr clip circulates on soundboards as a short, shareable version of the classic police siren, reduced to its most recognisable repeating pulse. Its exact origin is unclear, but the format fits how meme audio spreads online, cut down to a single second so it can be replayed instantly or dropped into edits without trimming. It remains popular because viewers instantly read the sound as law enforcement arriving, which gives creators a fast, wordless way to set up a chase, a bust or a joke about getting in trouble.