It's better to let someone think you are an idiot than to open your mouth and prove it.
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Explanation
Explain Bear
Listen up, buttercup. The joke is that it's better for people to *think* you're a dummy than for you to actually *show* them how much of a dummy you are by opening your yap. It's like, keep your mouth shut and people might think you're smart, but open it and, well, we all know how that's gonna end, huh?