Allo Olivier, c'est Thérèse is a short French greeting that circulates online as a soundboard clip for pranks and lighthearted messages. Its appeal comes from its specificity: rather than a generic hello, it names Olivier directly, which makes it feel like a real call from Thérèse and gives creators an instant, recognisable setup for a joke. Shared in prank collections and messaging chats, it is reused because it is brief, clear and easy to drop into the opening seconds of a video. The humour depends on the surprise of hearing a familiar voice address someone by name.