Key Prediction by Kaifu Wong - TrickAstonish your audience with the power of the Key Prediction 2. 0 an ingenious prop that allows you to seemingly read minds and predict any two digit number a spectator chooses, before they even think of it. Basic Effect: Introduce the elegant key tag and tell a captivating story about its origin. Now hang the key tag and invite a participant to freely choose any number between 0 and 99, it could be their birthdate, the last digit of their phone