Gemini Twins Effect: A magician removes two cards from a deck and place...
Ask the spectator to think of a number between 1 and 10. Have the spectator to shuffle the deck, count down to the number he/she thought of and remember the card. The card must be kept in the same position. You should turn your back on this part of the trick. When he/she is ready for you to turn around, take the deck, place it behind your back, count off 19 cards, reversing their order, and place them back on the top of the deck.
Bring the deck forward and ask the spectator the number he/she thought off. Begin your count with that number, dealing the cards one at a time. When you reach 20 cards let him/her name their card and you turn it over.