[Crimson Dynamo]

http://www.skepticreport.com/sr/?p=207

good example of how its done and why people say


"there is no way he could have known that" or "he told me exactly what my dream was about"

There is also the same dynamic going on about seeing "ghosts"

Humans like to be interesting and have interesting things to tell people and a story such as "omg this medium told me something amazing" fits the bill for many