Well, the way I would put it, someone who's getting a job at McDonalds is exceedingly unlikely to say out of the blue that they're joining a doomsday cult, while someone who's joining a doomsday cult is pretty likely to get told that they're joining a doomsday cult, at one point or the other (or to anticipate such a remark), and thus doesn't have to be uttering something irrelevant out of the blue.