I don't know if psychic powers are real, but once a long time ago I had a dream that a coworker of mine at the time was very adamant that she didn't like blueberries.  This seemed like an odd specific detail for me to be dreaming about.  Normally I would chalk this up to the usual dream nonsense, but curiosity got the better of me and the next time I saw her at work I said "This is probably a really weird question, but do you like blueberries?"  

She responded "Not particularly."  

I'm just going to go ahead and take that as proof that I indeed have some sort of mystical psychic abilities.  I have no idea how to tap into these powers on a regular basis, or what advantage I might gain from the knowledge of someone's preferences for a certain type of fruit, but it was still pretty cool, I think.