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A person who thinks they're the king of the mountain, but they're just a smelly sock on a hot day.
My cousin thinks he's a rockstar, but he's just a sad trombone in a disco.
My boss thinks he's the best at everything, but he can't even make a decent coffee.
My neighbor yells at the mailman like he's a personal enemy, but he's just a confused squirrel in a suit.