Bom Dia Boa Tarde Boa Noite brings together the three standard daytime greetings in Brazilian Portuguese, a phrase students learn early and adults use politely every day. Online the full sequence became a joke on its own, shared as a long WhatsApp audio and reused in memes where someone wants to cover every possible time of day at once. Because the listener might hear it in the morning, afternoon or night, the all in one greeting never feels out of place, which helped it spread as a universal opener.