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A person so dumb they made the dumb meter go backwards. They’re not just stupid, they’re negatively stupid.
My cousin thinks the moon is made of cheese. I’m not even mad, I’m negatively impressed.
This kid got a D on a math test. I gave him a -D. That’s a new grade.
He asked me if the sky was blue. I said, ‘No, it’s the color of your brain cells.’