The ability to completely control that most elusive of emotions…. fear!
The mentalist displays 4 boxes on stage and pulls up a lady who is admittedly afraid of snakes.
The mentalist announces that there is a snake inside one of them.
She is offered cash to place her hand inside 3 and it is the job of the mentalist to use his skills to influence her to choose the empty ones, if by some misfortune she places her hand inside the one with snake inside then she can keep the money.
Needless to say she voluntarily and freely chooses to place her hand inside the three empty boxes, and in the end a snake is removed from the one box left and the others are shown empty.
The addendum to the manuscript details how to remove the spectators phobia on stage, completely! Very very powerful stuff!