The effect in detail: A spectator is shown a small envelope, just large enough to accommodate a playing card. In fact, it contains a single playing card. This prediction is left in full view on the table (or in her hand). This is the final prediction. It will never be switched!
The spectator is handed a normal deck of playing cards to carefully examine. In fact, you can use ANY deck - nothing is added or taken away. She can see the deck is normal, well mixed, and there is truly nothing out of the ordinary - nothing to hide!
It is explained that you will not touch the cards again - as a matter of fact, if you would like, she can keep the deck - you will literally never touch the cards!
She is told to deal cards into a pile one by one, from the top of the deck, face-up onto the table (or another spectator's hand if you would like). She is told to stop whenever she wants. It couldn't possibly be more fair!
Eventually, she stops dealing on a particular card. It was a truly free choice!
With empty hands, and with no sleights of any kind, the envelope is opened. There is a single card within - the same card that has been there from the start. The envelope is shown to be otherwise empty - as it truly is. THE PREDICTION MATCHES HER CARD!
When you perform this effect, it feels like REAL magic!
It is so much fun, so easy to perform, and truly devastating!
I know you have got to be wondering - the effect lives up to its name! But in case you need to hear it again:
Any deck is used.
Envelope has only one card.
The single card in the envelope is the one that will be revealed at the end.
Envelope is not gaffed.
No sleights of any kind.