Louis de Funès played the blustering Commissioner Juve in the Fantomas films of the 1960s, a series of French crime comedies built around the masked criminal Fantomas. His wide-eyed, high-pitched reactions became one of the most recognisable parts of that screen persona, and short exclamations like this ah are now shared online as compact reaction sounds. French viewers recognise the voice instantly, while other creators use it for the same reason, because a single startled syllable can carry a whole comic reaction without translation.