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There is no widely documented source for this short clip, so it is best understood as an online reaction sound rather than a line tied to a single show or film. Its appeal comes from the wording itself, which is instantly recognisable in everyday conversation and easy to drop into a meme, reply video or group chat. Because the phrase is so general, creators use it whenever a question feels unnecessary, turning an ordinary exchange into a quick joke about common sense. That flexibility has kept it in circulation as a short, shareable punchline.
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A short spoken clip saying you should know the answer to this, used as a sarcastic reaction when someone asks an obvious question in memes and short videos.
The clip is a brief spoken line, just under one and a half seconds long, in which a voice states that the listener should already know the answer. It is delivered plainly and directly, without music or background noise, so the words land as a blunt little reprimand. Heard on its own, it feels like a friend losing patience in the nicest possible way, or a teacher pointing out the obvious. That mix of confidence and mild exasperation is what gives it its punch, turning a simple question into a joke about someone missing something that was right in front of them.
