Robin Williams alternates his serious movie roles with "antic jester" roles, posits Entertainment Weekly, and movie viewers trying to figure out which is which should look for the beard. Facial hairs indicate serious roles, for example, "Good Will Hunting," "Awakenings," "Moscow on the Hudson" and "Being Human." The exception to the rule is Williams' clean-shaven and serious appearance in "Dead Poets Society."

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- Leah Garchik

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