Boa noite galera do WhatsApp is a classic example of the short voice greetings that circulate in Brazilian WhatsApp groups, where a single voice note can become a shared joke or nightly ritual. Rather than coming from a film or television show, its appeal comes from its everyday familiarity: the kind of message friends send when they are heading to bed. Soundboards have preserved clips like this because they are instantly recognisable, easy to reuse in chats and edits, and still feel personal even when they are replayed many times.