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An entire car or cars on the New York subway's S line are reportedly done up in advertising for Cottonelle toilet paper, including this: "the very walls are sheeted with faux toilet paper wallpaper." A terrifying precursor to covering the outside of the train in toilet paper as well? Or merely a thoughtful nod to subway poopers? Either way, everyone now knows what the "S" stands for. (Too easy?) [Guest of a Guest/ Earlier]