I have referred to myself as a 'casual psychic' for several years. I can't control what I can do, and what I can do is never guaranteed to work. My old friend put me to the test a few weeks ago. He IMed me and said, "If you're a psychic, tell me what anime I'm watching at this very moment and I'll buy you a 24-pack of Pepsi."
Without skipping a beat, I replied. "Trigun," I said. Now, I have never watched this show and I had no idea he was, either. But I was right and he was dumbfounded.
When I used to work at Pizza Hut, I would - on an average of probably once per week - answer the phone before it rang. It only happened if I was walking by the phones and got the impulse to pick up the phone... and then the customer would have just finished dialing. They'd get confused because they wouldn't have heard a ring. Much funny.
I'm pretty good at knowing what someone's going to say before they say it or plucking a thought from someone's head. I think that's mostly attributed to my observational/discernment skills, though.