An expression (a French idiom actually = politeness always) a classy and cool person says whenever he/she has the right (in a certain context) to be rude but does not use this very right.
When someone doesn't answer a question, and immediately changes the topic. (Beneath the Blue Sky on yahoo answers)
"si les affaires de cul mettent en émoi toute la frange palinesque et hypocrite des anglo-saxons ainsi que quelques féministes d'arrière garde et autres roquets tourmentés, il faudrait un peu évoluer" (in a comment of MarJacq on Jean Quatremer's blog, 27/10/2008)
or
"Actually, I'm not going to answer this question. Instead, I'd like to talk about something completely different." (in a comment of holyhol... on yahoo answers)