El Pato Cuack is a Spanish-language meme sound built around a single exaggerated duck quack, shared online as a short reaction clip for jokes and silly edits. It circulates mainly through soundboards and short-form video, where creators reuse it as a quick, instantly recognisable punchline rather than as part of a longer scene. Because the sound is brief and needs no translation, it travels easily between Spanish-speaking audiences and wider meme communities. Its appeal is its simplicity: one absurd animal noise can deflate a serious moment, mock a mistake or close a joke without any explanation.