This is one of the finest book tests around. Simple and direct with great impact. You can learn this in an evening and once you perform this you will never leave home without it.
Collossus Directory Book Test: A wonderful, easy to perform book test using an old phone directory. The performer displays a series of books, requesting that the spectator choose one. It is an old phone book. The spectator is now handed a knife or letter opener with the request that he/she insert the blade anywhere in the book and to open to that page. Next, the spectator places a finger on one phone number. Concentrating on the spectator's thoughts, the performer is able to discern the chosen number!
This is a very clever effect that appears to be above board and innocent, but the workings are diabolically simple. You will perform this often after ione performance.