The line comes from Dewey, the youngest brother in the sitcom Malcolm in the Middle, known in French simply as Malcolm. In the French dubbed version his deadpan disappointment became a standalone reaction clip, shared on soundboards and in meme edits. The full phrase je ne m'attendais à rien et je suis quand même déçu sums up a very specific comic frustration, which made it easy to reuse far beyond the original scene. It remains popular in French speaking online spaces for everyday letdowns.