So, if a major hack attack, or an odd unexplained IT disaster, does happen to occur on Friday 13, then it may not be purely a coincidence, for the same reason that it wasn't a coincidence that airplanes crashed into the World Trade Center on September 11 (911). Here in the US, #911 is the number to call for reporting crime in progress or emergencies, so the date of the planned terrorist attack was intended to be ironic. Back in the '90s some computer viruses were programmed to sit in the background and drop their payload on Friday 13.