Kate Moss, Demi Moore, not so much. But in the case of Oprah Winfrey, Argos, yes, she does profess to know better. Constantly. Her entire marketing empire is centered around selling that very proposition.

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And you, to whom adversity has dealt the final blow
With smiling [faces] lyin' to ye' everywhere ye' go
Turn to, and put out all your strength of arm and heart and brain
And like the Mary Ellen Carter, rise again.