There's one guy on Blogger (of whom I'm aware) who is predicting that San Francisco and Los Angeles will be destroyed supernaturally next year. Of course, I don't think it will happen. I have asked if he will admit he is a false prophet (according to his own faith, if it doesn't happen. Others have asked more complicated variants before I. He is very evasive. But I did get this out of him. He refuses to consider the possibility that his god lied to him. So what happens when the deadline approaches? If his prediction comes to pass, of course, he will feel vindicated. But if (much more likely) it does not, he may be cause for concern. Perhaps he will try to bring about the destruction himself. Perhaps he will be able to concede that he has been living a lie. Perhaps he will go someplace else and set a different time or fall back on "no one knows the day or hour." Or perhaps he will snap completely. I really don't know.
Updated for error.