The line comes from Harry Potter and the Philosopher's Stone, the 2001 first film in the series, during the Christmas morning scene at Hogwarts where Harry is stunned to find presents waiting for him. As short movie quotes were ripped and shared on soundboards and in fan edits, this moment was isolated for its clear, standalone meaning. It needs no setup to understand, so creators reuse it for birthdays, holidays and unboxings, and its connection to a beloved childhood film keeps the reaction feeling nostalgic as well as funny.