Card trick: the marked pack

Wherever card games are played you are likely to find a pack of Bicycle League cards in use. If the game is Bridge most of the modern Bridge packs are one-way designs. Noticing this to be the case you remark that most packs of cards are secretly marked by the manufacturer and, while talking along this line, run through the cards, apparently studying the backs but really sorting them so that all the cards are one way except the A's which you leave reversed. Hand the pack to be shuffled, take it back and as you deal it face down you pick out the A's. There will be plenty of folks to offer you all kinds of money to teach them to read any cards from the backs. This stunt is quite sensational, creates good publicity and provokes a lot of favorable comment.