Many testimonies of 'spirit guides' giving known-only-to hearer accurate family information (not cheap stage-act types using an 'assistant') to lure in victims and then soon mercilessly torturing all those involved, both physically and psychologically.
You can't trust testimonials for psychics or astrologers or palm readers. These con-artists design the experience in a way that allows people to suspend their critical thinking skills. Once they acheive that, they are able to take litterally hundreds of guesses until they hit one that the mark reacts to, and then emphasize the hits. That's how they arrive at the "known-only-to hearer" information. Either that, or they do prior research if they know you're coming. Either way, it's all been proven to be a scam countless times, but people still believe in it. Fools and their money are soon parted.
If you're superstitious and you already believe that you'll be bothered by demons if you go to a palm reader then it's not hard to see why a you might come away from a palm reading (or whatever) only to experience a bunch of 'spooky' events. You leave the con artist in a state of hyper-sensitivity to any event that might be perceived as supernatural. When you happen upon such an event, you immediately explain it as being supernatural, even though it has a reasonable explanation that does not require a supernatural cause.
Once you've settled on this supernatural explanation an odd psychological effect takes hold - the more evidence that goes contrary to your belief in the supernatural explanation that you see, the more you dig your heels in and hold tight to the supernatural explanation. This is the same sort of effect that doctors struggle with when it comes to getting kids immunized. Some parents have a (false) belief that immunizations can cause autism, seizures, you name it. The more information that is presented to such a person, the more they hold to their false belief, but the moment that any evidence seems to confirm their belief (i.e. an autistic kid that was only diagnosed as such shortly after initial imunization) they seize on it and their belief is confirmed, even if there are litterally millions of kids getting vaccinated that don't come out autistic.
It's the same thing with supernatural believers. Any time they hear a sound they don't expect, they may ascribe a meaning or supernatural origin to it. Then when confronted with evidence that it's not supernatural at all, they'll continue to hold fast to their belief. Or, in the occassion that they might conceed that a particular event wasn't supernatural, they imediately flood the skeptic with a list of other so-called evidence so long that the skeptic figures them for a lost cause and doesn't bother disproving each event individually....it's just not worth it.
