There are few things that annoy me more than to see a preview for some movie depicting fantastical and supernatural happenings and then to see the trailer end with based on a true story or based on true events. These movies aren't based on "true events" - they're based on someone saying these are true events. The "truth" is that someone said it happened, not that it happened.
False marketing combined with promoting anti-reality based beliefs for profit just bothers me. Which is why I'm so annoyed with the commercials currently playing for the DVD of The Haunting In Connecticut.
It was bad enough the first time that this fraud was dreamed up, but to reward the hucksters with a movie based on their scam is just rotten.