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Thinking you're the king of the hill and everyone else is a dumbass who can't see you're better.
My cousin told me he's the best at chess. He's been playing the same game for 10 years.
My boss says he's the only one who knows how to do his job. He's been there 3 days.
My neighbor claims he's the smartest man in the neighborhood. He owns a lawnmower.