Mental Key Prediction by TCC & Conan Liu & Royce Luo - TrickMental Key Prediction enables you to astonish your audience by flawlessly predicting any four digit number chosen at random by them, inscribed on the back of a wooden keychain, without any use of force. Effect: The magician introduces a walnut wood key pendant with a key attached to it, and begins to tell an intriguing story. Four random numbers are called by the audience, which may even be an important date or time. The magician turns the keychain