" It is easy to conceal an emotion no longer felt, much harder to conceal an emotion felt at the moment, especially if the feeling is strong. Terror is harder to conceal than worry, just as rage is harder to conceal than annoyance. The stronger the emotion, the more likely it is that some sign of it will leak despite the liar's best attempt to conceal it. "

― Paul Ekman , Telling Lies: Clues to Deceit in the Marketplace, Politics, and Marriage