It's common knowledge that a goatee, especially a sharp triangular goatee, is indicative of an inherently evil nature (at least in fiction). The question is why. Does it have something to do with facial hair? Is it just a convenient fictional device that's been absorbed by culture at large? Something altogether different? It's still not completely clear, but a study conducted by Dr. Derrick Watson and Dr. Elisabeth Blagrove of the University of Warwick has managed to prove one connection; people react the same way to an upside down triangle as they do to an angry face.
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