The thing is called the Wyoming Incident. You can google the legend, but it's untrue. Still, the videos is shocking. So please, anyone who has headache problems or a weak mental state (gets scared fast), do NOT watch it. I can't stress that enough. Some people, who played this "game" (watch the videos in certain conditions) fell ill. I heard they suffered from vomiting, headaches, hallucinations, unexplained fear etc. And I am NOT trying to gather some audience, it happened for real, and again: please, anyone who has headache problems or a weak mental state (gets scared fast), do NOT watch it.
I think I've warned enough. If you don't feel anything after watching, good for you.
http://www.youtube.com/watch?v=IBHkW0aKHRc