Well this is my first instructable even though I have heard of the site through other people, but, even though, get ready to be amazed with this simple but very effective card.
Step 1: Step 1
First you get a normal deck of cards and show it to the audience (or person) and tell to pick a card while you aren't looking. In this example the card is an 8 of spades.
Step 2: Step 2
Now we're getting to the fun part! :) gather the hand back into a single deck. Next, you can shuffle well and do the important part... ...you even out the deck again and while doing so glance at the bottom card. < Ace of diamonds>
Step 3: Step 3
Next you break the deck into halves. the important part is that you point to the top half of the deck and tell the person to put the card on top of that. then you put the bottom half of the deck onto the top half of the deck.
Step 4: Step 4
now you start drawing cards from the deck. once you run into the old bottom card (aka: ace of diamonds) the next card is... ... an eight of spades