In a captivating performance, John presents a large box featuring a slit on top. He boldly places his wallet filled with cash, an expensive watch, and even his wedding ring inside—adding a humorous twist by including his wife! A spectator then secures the box with a padlock and attempts to open it using a selection of keys, but none succeed.

John confidently claims he possesses the one key that can unlock the padlock. The spectator mixes this key with the others and taps each one against a wine glass, while John attentively listens to the distinct sounds produced. Any keys that don’t resonate correctly are discarded through the slit, making them unreachable.

In a stunning display of skill, John accurately identifies the correct key based solely on its sound and successfully unlocks the padlock, concluding this extraordinary act!