Out of This World (card trick)

Explanation of the Out of This World card trick with a prepared deck of 10 cards (solid cards are face-up; hatched cards are of the hatch colour, face-down)
1. The top and bottom cards are extracted as marker cards.
2. The audience member freely deals cards onto either marker until stopped by the illusionist.
3. The illusionist reveals and puts the next two cards onto opposing piles.
4. The audience member freely deals the remaining cards; the piles may be of unequal size.
5. The illusionist surreptitiously moves the bottom card to the top of the incorrect pile, and splits the piles to show the cards.

Out of This World is a card trick created by magician Paul Curry in 1942, in which an audience member is asked to sort a deck into piles of red and black cards, without looking at the faces. Many performers have devised their own variations of this trick. It is often billed as "the trick that fooled Winston Churchill" due to a story describing how it was performed for him during World War II. The method behind the trick is simple and essentially self-working, and can be enhanced by the presentation of the performer and the use of other principles of magic.

Effect

1. The performer takes a deck of cards, and places on the table two face-up "marker" cards, one black and one red; the black on the left and the red on the right. The performer tells the spectator that he or she is going to deal cards face-down from the deck and the object of the exercise is for the subject to use their intuition to identify whether each card in the deck is black or red.
2. The performer takes one card at a time from the deck, face down, and asks the subject to attempt to divine whether it is black or red. The subject states their choice, and the performer then places the card in line with the appropriately coloured marker card, overlapping it at the bottom.
3. About halfway through the deck, the performer stops and announces that it is necessary to switch sides, in order to prevent a possible preference for one side over another from confusing the results. The performer deals two new marker cards onto the existing lines: a red one on the left, and a black one on the right.
4. The performer then continues as before, dealing cards face-down from the deck onto the subject's choice of the black or red line.
5. When the deck is exhausted, the performer instructs the subject to gather up and somehow reveal the left-hand line of cards; the performer does the same for the right-hand line.
6. The exposed lines reveal that every one of the subject's guesses was correct, and the black and red cards have been exactly sorted by colour.

Method

The methods for magic tricks, and certainly the method for what is perhaps the most famous card routine of the twentieth century, are not to be divulged to laymen frivolously on public web pages despite the extensive discussion of this matter in the Talk section. Removing the description from this page is not "vandalism," but a form of valiant protest against the original author's high-falutin view of themselves as the arbiter of whether or not the method should be exposed. Since the methods for magic tricks are collectively "owned" by the magic world and its members, it has always been standard operating procedure that the methods may be explained to the public in a situation in which they have to pay for them, such as in a book. Whether the book is purchased or consulted at a library, the curious party has to invest money, time, or both in pursuit of the method. The original author of this entry does not have the RIGHT to explain the method here.

Link with Winston Churchill

Chapter 13 of the book Magician's Magic by Paul Curry describes a dinner party during World War II at which a magician named Harry Green performed the trick for Winston Churchill. According to the book, Churchill insisted that the trick be performed for him half a dozen times, and was "repeatedly baffled".