"Have you ever caught someone in an embarrassing moment, act or expression. They
know it and so do you. And you probably have a good laugh to yourself for awhile. What happens next is after awhile they emphatically act out the opposite of what you saw them do to try and make you think that you didn't see what you first saw. You can be assured what you first saw is the truth, when you see them act out the appropriate behavior that they learned but did not follow. It's too late, people are not as dumb as you think.
Just consider it a matter of good human nature for them to try and erase their bad behavoir in this fashion and not an insult to your intelligence, "See, see I'm really not like that!"
Copyright 2010 Thomas Paul Murphy