Fire engine horns have been a staple of emergency vehicle sound design for decades, with the deep air horn used to warn traffic and clear a path for firetrucks. As a standalone clip, this kind of blast became popular online through soundboards, video editors and meme creators who needed a quick, recognisable cue for urgency without a full siren loop. It is still used because it is instantly understood across languages and contexts, whether for comedy, action edits or reaction videos, and its short length makes it easy to drop into almost any scene.