The idea of the War on Christmas.
"The War on Christmas is a little like Santa Claus, in that it (a) comes to us from the sky, beamed down by the satellites of cable news, and (b) does not, in the boringly empirical sense, exist. What does exist is the idea of the War on Christmas, which, though forever new, is a venerable tradition, older even than strip malls and plastic mistletoe." The New Yorker "Just as Christmas itself evolved as a way to synthesize a variety of winter festivals, so the War on Christmas fantasy is a way of grouping together a variety of enemies, where they can all be rhetorically machine-gunned at once."