A trick with two decks of cards!

Imagine magician shows two decks and the spectator selects one. They pick a random card and place it between 2 red Kings.

After that the magician shows the second deck, and takes out the two red Kings, with just by a snap of your fingers, 2 red Kings catch one card, and that card was same as the card that spectator choose from the first deck. An impossible transposition.

No force
Easy to do
Spectator shuffles themselves.

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