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Someone who is known for being bumb but suddenly said something wise.
"Hey, I figured out and sorted the situation on my own. "
"You're probably the 'sharpest butter knife' I've ever seen."
the sharpest corner of a large stone (adage) - a proverb referring to the best ability of a person.
When it's about to hit you, and it's too large to escape from, you mainly try to get away from the sharpest corner of a large stone. Similarly, you should only show the greatest talents possessed by you to others—not the dumbest ones.