HOLY SHIT
I knew a guy who was way, way into this way back when. He was absolutely convinced that Planet X was going to come, all our cell phones would stop working, the earth would flip on its axis, the skies would turn red, and aliens would invade. He had his car filled with camping gear and survival stuff at all times and every few weeks he would freak out and think it was happening and leave the city.
It goes without saying that he had some preexisting mental problems but I distinctly remember him reading this lady on the internet who was creating more mental problems for him by being extremely firm and detailed and feeding more delusions to her followers, and giving voice and credence to other weird crazy shit that he already thought.