The duck quack is one of the oldest and most recognisable animal sounds in comedy, long used in cartoons, children's shows and slapstick to signal silliness or a sudden surprise. Online, it spread through meme edits, reaction videos and short-form clips, where a single quack can replace a caption or a punchline. Because it needs no context or translation, it works across languages and platforms, which is why creators still reach for it for quick, light-hearted humour in pranks, fails and animal content.