This calls to mind the time news of an "aswang in the city" crept into everyone's consciousness sometime in the late 90's. There were daily headlines (albeit in the tabloids) of purported "victims" yet not one of the so-called survivors ever came forward to attest to its veracity. This is how quintessential urban legends come to be. An incredible tale gets passed on so many times to so many people, it eventually becomes truth. In this case, all the hullabaloo started from this one article in the Inquirer: http://news.inq7.net/sunday/index.php?index=2&story_id=29588&col=85. Notice that nowhere in the article was a specific date and time given by the visionary from whom the prophecy came? A similar thing happened when the deadly tsunami ravaged Southeast Asia December last year. A certain "Doug Copp", claiming to be a member of the world's most experienced rescue team, came out with an article giving tips on how to survive an earthquake. It was a good thing - or so we thought. Turns out, the article was a fraud and several disaster coordination agencies contested his "insights". Read more via: http://www.kahl.net/action/triangle_of_life.htm and http://www.snopes.com/crime/warnings/triangle.asp.
Ultimately, though, it all boils down to faith. Trust in God will all your heart. When faced with situations like these, prayer can be of great help. Faith can move mountains, or haven't you heard?
To find out which other tall tales you may have fallen for and which have since been debunked, check out: http://urbanlegends.about.com/ or http://www.scambusters.org/legends.html