Since I have been studying micro-expressions, I see them frequently. Here is a recent example: Jim Cramer called the Obama Budget the "Greatest Wealth Destruction By a President". Rober Gibbs, Obama's press secretary, was asked to respond (video below). At 11 seconds, he flashes a micro-expression for scorn (disgust and anger). Watch the first video on Paul Ekman's site and he explains it with an example of Kado Kaylin. Gibbs also shows the contempt micro-expression at 35 seconds. He then validates the expressions and admits he is concealing the way he really feels by saying "This is where I have to probably be careful."
Scorn at 11 seconds
Contempt at 35 seconds