Do the "11Th Card Trick"

Ever heard of the 11th card trick? If not you're in the right place!

Steps

Get a deck of cards, and cut it so that only 21 cards remain in it. Fan it out to your "Victim".
Tell him/her to choose a card, and NOT show it to you.
Then, tell him/her to put it anywhere in the deck.
Now, put all cards in 3 rows (7 cards per row, although put one card per each row then repeat, otherwise it won't work).
Now the tricky part, tell him/her to tell you which row he/she sees his/her card. For example, if he/she had chosen the King of Hearts and he/she sees the King of Hearts somewhere in the 1st row, he/she will say something like "My card is in the 1st row."
When he/she tells you which row, ALWAYS make that row the middle one you take. So if he/she chose the 1st row (or any other row, it doesn't matter), take any other row, then take the chosen row and put in AFTER the other row and then take the remaining row.
Do steps 4-6 only 3 times.
After you repeated it for the third time, turn the cards so that the cards would be facing down.
Now the easiest and victorious part, put the cards down anyway you like! But ALWAYS remember where you put the 11th card, so just count them (in your mind) until you reach 11. Then stop counting and keep on throwing or putting all the remaining cards down.
After you've thrown/put all 21 cards down, take the 11th card and show it to your "Victim". Ask him, "Is this your card?" Amazingly, he will say yes!

An alternative to this trick is to let the victim pick so many cards. If they pick card 11 in their choice then leave them there else take them away. Repeat until they have narrowed it down to the 11th card. They will be amazed when they end up picking the card themselves!
Remembering is the key here!
Always try to practice with yourself before trying with other people