Ok, my sister just sent me this video and it was pretty unsettling. The guy doesn't seem like a crackpot. I'm just sharing it because, who knows, he could be right and it doesn't hurt to be prepared, just in case….
www.youtube.com/watch?v=Jnh5jV3nJyM&t=23s
(For some reason, it's not letting me embed the video, sorry.)