Private buses in Kerala are famous across India for their loud, musical horns, which drivers use to announce their arrival and stand out on crowded roads. The distinctive multi-tone sound has become a recognisable symbol of Kerala road culture, often filmed by passengers and shared in travel vlogs, reels and comedy edits. Online, it is now used far beyond its original traffic purpose, signalling a chaotic journey, a busy street or a playful South Indian setting in short videos.