Full performance:
The mentalist offers her participant 5 blank cards and a Sharpie and instructs her to secretly write on each card a secret piece of information.
A name, a city, a word, a 4-digit number, and finally a drawing. (It can be ANYTHING!)
Once finished the cards can be fairly mixed by the spectator. The mentalist asks for the cards face down so that none can be seen and places them behind his back.
'I'm going to try to see what you wrote using only my fingertips and you are going to tell me if I am right or wrong.'
-Ok
'Let's begin... I am seeing... a word... yes, it is a word. I am seeing the word CLOCK... correct?
-YES!
'In this one, I can see numbers... I see the numbers 1, 7, 9...1792, am I right?'
-WTF?!
'I will try to see one more... My fingertips are starting to hurt... I see a drawing... what is this?... Is it a shoe?!'
-YES it is a shoe!
The mentalist hands out all the cards back to the spectator and encourages her to feel them. She will realize that she can't feel a thing!