If etiquette is about the One Right Way, pop-up rules make no such claims. They are free of the ethnocentric, classist pretensions of etiquette, because the rules they enforce are made-up. Their impermanence is a sign of their humility. No one is claiming that the withholding of last names is the mark of a cultured person. They are just saying that on this day, at this time, with these people, for this purpose, do not say your last name, and let us see what happens.
