The trick that can be explained

In card magic there is one trick that requires a lot of experience and sometimes technical skill. It is called “the trick that cannot be explained” because well... you can't explain it. Though I understand that non-magicians might find it hard to believe that there might be a trick that has no explanation and want to learn more about it, I would like to talk a bout a trick that can be explained.

A few weeks ago I was recognized as being a mentalist, (it is amazing what a few minutes on national television can do for one's fame) and I had the opportunity to do this effect that I will now explain to you.

As we discuss mentalists and psychic abilities the person I am having the conversation with remarks on how he saw a mentalist on television and the mentalist had asked the audience to look at a person and try to feel what kind of drawing that person might do. Since he was able to “sense” what kind of picture the person on television had drawn he wondered if it really was possible to just look at a person and get such a feeling. He had done so himself but was still not convinced.
I concentrate and I tell the person, right there and then, what he managed to pick up from the person he saw on television. I tell him exactly what kind of object he was thinking of and I don't have him write anything down or choose something from a deck of cards.
After this feat I fight the urge to tell the person how I did it, the sense of wonder he feels does not deserve to be degraded by my mundane explanation.

I can explain the trick to you because I will never be able to perform this effect again and although I might perform many similar effects, that might involve you, this information will not help you the least.

The explanation is quite trivial as many explanations are. To be able to do this trick you need to know what show the person had seen and remember the picture the person on television drew. You also need to do this effect for a person that will rather believe that you managed to read them so well that you can tell what object they were able to pick up on a week ago, instead of just remembering what the picture was. And in my case you also need a person that has forgotten that you were the mentalist on television performing the effect in the first place.