This sound is associated with Chaves, the Brazilian Portuguese name for the character from El Chavo del Ocho, the Mexican television comedy that became hugely popular across Latin America and Brazil. Short Chaves reaction clips spread widely through meme pages, reposts and WhatsApp forwards because they are instantly recognizable and easy to insert into edits. The brief 'ai' style reaction remains popular thanks to that nostalgia factor and its usefulness as a fast comedic sting, similar to a vine boom in very short meme edits.