Bonjour à tous is a standard French greeting meaning hello everyone, used every day in France and in French-speaking classrooms and videos. As a sound, it has no single famous film, song or television origin to trace; it is an everyday spoken line that creators use because listeners recognise it instantly. Short greeting clips like this spread through soundboards and social video as quick, friendly openers for lessons, streams and travel clips. Its appeal is simple: the phrase is warm, clear and unmistakably French, so it can set a language or a welcoming tone in less than a second.