It’s an impossible coincidence — with an ordinary deck.
The cards are shuffled over, and over, and over again — and each time, the spectator makes a series of free decisions. They choose everything — which pile to shuffle into which pile, which pile to turn face up, and which pile to turn face down. They can even change their mind.
Despite all of that – despite EVERY decision – the only cards face up in the end are under YOUR complete control. The face up cards can be anything you want – their phone number, the serial