Subjective view:"Liar" – A word most frequently served hot, seasoned with exclamation marks - best uttered unencumbered by evidence or a sense of shame.
Oh, for the gift of laughter and a sense that the world is mad. (--adapted from Raphael Sabbatini, Scaramouche)
Never turn your back on a person who would not have you laugh:
Stanch a laugh if you would avoid releasing gas from the pompous. An elevator is a good place to observe this rule.