Many moons ago in Australia I went to a medium/fortune teller who made an audio tape of the reading. Initially when I came out of it I was all 'wow - she was so good, she knew stuff'.
Years later I came across the tape under a car seat and had a listen. I was gobsmacked at myself.
There I was, feeding her information, which she delivered back to me minutes later in a slightly different format, but I didnt notice at the time that Id already revealed most of the things she was telling me.
Even if you resolve to say nothing leading, your body language gives away if they are going in the right direction or not and they will switch if they are not.
One of the most impressive ones I ever went to in terms of a straight cold read was a gay bloke in dublin city centre, near Break for the Border. I walked in, sat down, said 'hi' and he said 'how was australia?' (I had come back 4 months previously). To this day I dont know how he did it, I wasnt swinging my didgeridoo around, I wasnt practicing my boomarang throwing, and I wasnt wearing anything to indicate Id been. Maybe it was just a lucky guess, I was the right age group for a trip to australia. But straight off the bat like that was impressive

Mind you the rest of it was the usual vague rubbish.
My parents died in tragic circumstances and I have an aunt who regularly goes to a medium and gets 'messages' from them - I dont like to hear the rubbish she gets filled with, it just smacks of pulling the wool over someones eyes who WANTS to believe. She does get comfort from these messages, but the deception aspect is just not pleasant.