A klaxon is a loud warning horn originally associated with vehicles, factories and emergency signals, and its harsh tone is instantly recognised as an alert. Adding heavy reverb turns that practical alarm into a meme-ready effect, stretching the blast into a dramatic, echoing sting that works well in short videos. The reverb version circulates widely on soundboards and in meme edits, where creators use it to flag fails, interruptions and over-the-top reactions. It serves a similar purpose to a buzzer in game-show style edits. Its simplicity keeps it useful: one loud, unmistakable warning that needs no explanation.