The clip comes from Bonitinha, mas Ordinária, a well-known Brazilian work whose title pairs pretty with ordinary in a deliberately provocative way. Lifted as a short excerpt, the mentira ha ha moment travelled online as a reaction sound for calling out dishonesty, especially in Portuguese-language memes, messaging audios and short-form videos. Its appeal is in its clarity: the word mentira does the accusing, and the laughter does the mocking, so it works even without subtitles or context.