EFFECT :
The performer fans the pack showing the cards to be all
different. After having the pack cut several times, a spectator is
requested to cut the cards wherever he pleases; while the
magician's back is turned, remove the top card, note what it is,
insert that card in the middle of the pack and then place the whole
pack in the outside pocket of his coat.

This done, performer turns and tells the spectator he will remove
cards one by one from spectator's pocket. Simultaneously, the
spectator is to spell his card mentally, one letter for each card
mentally, one letter for each card so taken, and to think of the
word 'Stop', when the last letter is reached. After removing a
number of cards from the pocket, performer suddenly says, 'You
have just thought of the word "Stop," and the card I am now
holding is the very card you are thinking of.' Spectator names the
card and the performer displays the card he holds-it is that very
one.

HOW IT'S DONE....
The pack consists of four sets of duplicate cards, twelve
cards in each set. The cards are: SS, KH, QC, 9H, AS, 8C, 3C, QH,
9S, 4H, JH, KH. Now, regardless of where the spectator cuts the
pack, if he looks at the top card and replaces it in the middle of
the pack, the twelfth card from the top will always be a duplicate
of the one at which he looked. Any card he may look at will have
exactly twelve letters in its name, therefore all the performer has
to do is to stop at the twelfth card, the astounding result follows.