Matt Lauer, long-time Today Show host, was fired from NBC this morning for allegations of "inappropriate sexual behavior in the workplace".
From a nonverbal perspective, one profound warning signal of insincerity is a "smile" (a feigned smile) that's asymmetrical - particularly when it's displayed chronically. One of Lauer's common go-to expressions is pictured in two examples here.
To nuance one of Matt Lauer's default expressions even further - one side of his mouth (typically his right) vectors upward - while the other mouth corner is directed down (usually his left). At best this expression signals sarcasm - but very often it's outright duplicitous. If you see this type of feigned smile directed at you, take heed - for, with high probability, the person making this face has thoughts and emotions which are in direct contradiction to what they're saying verbally.
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