The magician shows a deck of cards, being all different and in random order
Next he hands the deck to a spectator and asks him to deal the cards, one by one, face up on the table, and to stop whenever he wants to (no force)
Incredibly the card that the spectator stopped at matches the prediction that is inside the envelope prediction since the very beginning!
The envelope is immediately shown empty after the prediction is removed
Completely free choice (the spectator stops at any card).
No switching of cards
The magician never touches the deck
Very easy to perform