The mentalis, the corrugator, all those little muscles of the face, those are the first things you learn in art school anatomy. After that, you can tell a fake smile because the risorius and platysma muscles pull the lower lip down and out, squaring it and exposing the lower teeth. Just for the record, knowing when people are only pretending to like you isn't such a great skill to have.
( Chuck Palahniuk )
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