The line comes from El Chavo del Ocho, the hugely popular Mexican television comedy created by Roberto Gómez Bolaños, who also played the orphan boy El Chavo in the 1970s. In the show, Chavo uses the excuse when a remark escapes before he can hold it back, turning a small social mistake into a running joke. Decades later, short clips of the line circulate in Spanish-language memes, reaction videos and chat audios, where it still works because almost everyone recognises the feeling of saying the wrong thing at the wrong moment.