I upvoted you because 95% is way high, but I agree with you that it's non-negligible. There's way too much weirdness in some of the cases to be easily explainable by mass hysteria or hoaxes or any of that stuff - and I'm glad you pointed out Fatima, because that was the one that got me thinking, too.

That having been said, I don't know what they are. Best guess is easter eggs in the program that's simulating the universe.