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One of the greatest decorum scenes in movie history graces the climax of 8 Mile, Eminem’s semiautobiography. He gets talked into a competition at a dance club in downtown Detroit where hip-hop artists (orators, if you will) take turns insulting each other. The audience chooses the winner by applause. Eventually, the contest comes down to two people: Eminem and a sullen-looking black guy. (Well, not as sullen as Eminem. Nobody can be that sullen.) Eminem wears proper attire: stupid skullcap, clothes a few sizes too big, and as much bling as he can afford. If he showed up dressed like Cary Grant, he would look terrific—to you and me. But the dance club crowd would find him wildly indecorous. Clothing is the least of his decorum problems, though. He happens to be white, and everyone else in the room is black. Eminem nonetheless manages to devastate his adversary by revealing a nasty little secret: this putative gangbanger attended a prep school! All the poor guy’s hip-hop manners are pointless, because the audience finds them phony.
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Jay Heinrichs (Thank You for Arguing: What Aristotle, Lincoln, and Homer Simpson Can Teach Us About the Art of Persuasion)