Once, when I was at the Berlin Zoo, the chimps began spitting and throwing feces at the passing tourists.  Hurling it through their cages, the bars served as little resistance against their form of attack.  Rather than running away and ending their picture taking like the others, there still remained a small group of Japanese tourists; they were trapped between the souvenirs and the hot dog stand, stooped down, trying to avoiding the flying shit, while snapping shots of the action. 

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