The sound comes from The Army Mascot, a Pluto cartoon released in 1942, where exaggerated cartoon impacts helped sell physical comedy without dialogue. The bonk and cowbell combination was later catalogued as a classic cartoon effect, which kept it in circulation for editors long after the short itself faded from regular viewing. Today it survives mainly through soundboards and short-form video, where creators reach for a familiar, instantly readable cartoon hit to mark a bump, a blunder or a sudden realisation.