Rule out the possibility of invisible, flying, silent dragons in your room right now. Okay, now rule out the possibility of their existence anywhere. Is that reason to believe it? EDIT: If you want, put unicorns, fairies, leprechauns, etc in for the dragons. It's all the same. You can't make a conclusion and then attempt to find evidence to support it. You need to take what evidence you have, and what you know and/or can reason, and then go with the most logical choice. To respond to the thread: If you can't guess by the way I responded above, I don't believe in any of the common conspiracies/monsters that are prevalent in today's society. EDIT 2: If I were to find out about one specific possibility/question, it would be "Do any supernatural things actually exist?"