Because of course is such a common everyday phrase, this clip works without needing a famous scene behind it, and that flexibility is part of its appeal online. Short reaction sounds like this thrive on soundboards and in short-form edits, where a single line can punctuate a joke in barely a second. Its lasting use comes from its versatility: it fits sarcasm, agreement, resignation and gentle mockery, so creators keep reaching for it whenever a moment is too obvious to explain.