A deck of cards is removed from its case, which is shown empty. The joker is removed from the pack and replaced
inside the case, as you explain that it is a prediction.
A spectator selects a card from the rest of the pack.
However, it is not another joker-it is a completely different card, for example the king of diamonds. The performer
picks up the card box, holding it with the mouth toward the audience so that everyone can see the incorrect joker
within. He flicks his finger against the box, and suddenly the joker change into a king of diamonds!
The card is removed from the box, which is still seen to be otherwise empty!