There might be some things we don't understand, like the 21 ounces or whatever that one loses after death. Very interesting, so far unexplained, yet documented phenomenon. Similar things can be said about certain reincarnation and near death experiences - how could they know some of the stuff they do? Maybe there are yet unidentified physical explaination, maybe something else. I am looking forward to answers either way.
For stuff like tarot, there are probably some interesting body language or physiological things that are behind it. I have a hard time believing most stuff like this and mediums. However, that could be that there are a large number hacks obscuring an extremely small number of people with actual talents. I'm also looking forward to any research finding on these topics.