They seem to sneak past the alarms that my bluntness usually sets off. Mike Dunford has a nice quote from that subversive radical, Terry Pratchett:
“Look at it this way, then,” she said, and took a deep mental breath. “Wherever people are obtuse and absurd . . . and wherever they have, by even the most generous standards, the attention span of a small chicken in a hurricane and the investigative ability of a one-legged cockroach . . . and wherever people are inanely credulous, pathetically attached to the certainties of the nursery and, in general, have as much grasp of the realities of the physical universe as an oyster has of mountaineering . . . yes, Twyla: there is a Hogfather.”
(For those not familiar with the backstory, the Hogfather is the Santa Claus equivalent in his fantasy stories.)