Besides aliens and UFOs, not sure what to think about those. But seriously, watching these TOP 10 NIGHTMARE INDUCING VIDEOS on youtube is just blurry shadows of someone poking their head around a corner or someone in a costume. I get that people want to believe in the paranormal, but c'mon guy, I've seen b-movie schlock more convincing than the shit out there.
I still have a vividly real memory of a green man smiling at me through my window. I'm sure it was a sleep paralysis shit, but I always avoid looking out windows at night now.