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X The introverted response to the presence of a xenobiotic crown may include headaches, breathlessness, appetite loss, and hyperventilation. The extroverted response generally takes the form of that manic leaping and twirling known as "tarantism"—it is as if the sufferer is trying to "dance off" the crown. Only once has this been known to be successful: in thirteenth-century Germany, the stomping and jumping of a crowd of afflicted persons caused a wooden bridge to collapse into the river below. As the dancers were swept away in the swift spring waters, their crowns could be seen slipping from their heads to sink to the stony bottom where they remain to this day for tourists to gaze at through glass barges. .

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