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Here's a Mark Twain story that's very unlike those he became famous for, but when I read it back in Catholic high school, it left a deep impression. It concerns the deeply religious residents of a small village in Austria during the late sixteenth century, and what happened to several of them when a strange man began to visit their insulated homeland. There's little of Twain's humor here; this is a horror story, a parable. . . and a warning.