It's funny, growing up I met at least four different people who describe seeing this guy. I, myself, used to see shadow people but never this guy. For those calling him Satan I think your assertion should be noted as speculation at best. I can say, from my experience, I got "thoughts" that weren't mine and I feel like this goes beyond Christian mythos. I think I know what's going on, but its a bit more heavy than people are ready for.