Then take the wallet and place it in your pocket. You now know the exact thought written down in the wallet without even having to open it up!
Easy to master. Easy to astonish!
History In Magic
The secret of this effect can be credited to the Mind Readers Billet Reader (this original prop can be seen in the demo). Nelson Enterprises sold this billet reader effect in the 1950's/1960's. Years later Tenyo released a similar category effect called Mind Scanner. Since then others have put out versions using the same secret.