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A person who thinks they know everything, but when you ask them about something specific, they look at you like you just asked them to solve a math problem while wearing a clown suit.
My cousin thinks he's a genius, but he can't tell me what happened in the last episode of his favorite show.
My teacher said I was a mile wide and an inch deep because I knew all the presidents but didn't know how to add fractions.
My friend tried to explain quantum physics to me, but I had no idea what he was talking about.