The line is a common everyday French question, and its humour online comes from that ordinariness rather than from a known film, show or celebrity source. Shared as a short soundboard clip in French speaking meme spaces, it is used as a standalone reaction that needs no setup or explanation for anyone who understands the phrase. Its brevity makes it easy to reuse in edits, group chats and short videos, where it signals mild disbelief that someone has forgotten the date, the weekday or a plan everyone else remembered.