 The mentalist then asks the spectator to pick one of the two books, but uses a force to ensure they always pick the one containing the memorized word.To force the page a number of methods are used, the most common has the mentalist leaf through the non-force book at high speed and asks the spectator to call "stop" at any point.When the spectator stops him, the mentalist states that they have stopped on a certain page and asks the spectator to open the force book to the same page.