A station is made especially for this trick. It is a big glass window in front of a small room. It is built in a way, so that it is not entirely visible to the crowd.
The deck used in the trick has a couple of special features. One is that the card you want the audience member to pick has a duplicate available.
The second is a card which is cut from the top and is placed in front of the card that will be picked.
When the card selection process is done, the magician puts the partially cut card in front of the card to be selected.
As he/she pulls the cards back, the member of the audience tells him/her to stop.
The magician can now very easily pick the pre-determined card becuase he/she cuts the deck into two, with the help of the partially cut card.
The magician then distracts the person involved in the trick by making some strange hand movements around the deck. This distraction plays a crucial role in the trick.
The Real Trick
As the magicians distracts the audience member, one of their assistants sticks the pre-determined card on to the window from the inside of the station without anyone noticing. The magician then slams the cards on to the same place on the window and the deck splatter only to leave the right card on the other side of the window.