The trick is to have another pair of exactly the same pair of shoe laces inside your pants. Tie one of them to the center of the other and hold it with your hand in your pocket. Your shoe is tied all the time but it is not visible to the audience because of your long trousers that cover the knot. As you shake you leg, pull the shoe lace you hold in your pocket and then you pants to reveal the hidden knot.
Another thing you can do(recommended) is to take a rubber band instead of the other shoe lace and tie one end of it to the center of the fake shoe lace in your pants. Attach the other end with a safety pin to you pocket. Hold the rubber band stretched so the shoe lace is visible. As you start to shake your foot release the rubber band. It will pull up the fake shoe lace in your pants and you are ready to pull the pants and reveal the hidden knot!!
Practice a few times in front of your mirror to master the trick. Good luck!!

Have a shuffled deck of cards and place it on the floor in front of them. Pick one member of the audience and tell them they will perform the trick with you. After you picked one tell them to pick a card from the deck and place it on top of the deck.

Now tell them to divide the deck into five stacks. After they divided it you will point at all the decks and show the audience where the chosen card is placed. and now comes the tricky part, while you point at the stack that has the right card drop a pinch of salt onto it. Remember not to touch the cards during the whole performance to make a more dramatical appearance. Now tell your assistant to put the deck back togetherin in the different order.

When all is set, kick the deck slightly with your foot to make the cards slide to side. Examine the deck and pick the card that has the largest distance between it self and the card next to it. Remember to add creativity to your performance to be more persuasive and set the magic amosphere. Always practise before performing in front of audience. Good luck!

After showing the bill and the pen to the audience, start folding it towards you while hiding the pen behind the other half of the bill. While doing that take the tip of with the third and the fourth finger of your right hand.

Continue folding the bill with the first and the second finger of your right hand as in the picture while still holding the tip with the other two fingers.

While folding it, slowly point the top of the pen towards the audience and attach the tip to the pen from the outside of the bill. You can distract the audience by showing them the inside part of the bill and assuring them that the pen is realy inside it, doing so you'll hide your pen tip with the bill.

Now when you got it attached, show it to the audience and you are ready for the magic part..

Now place the coin with one or two fingers in the bottom of your palm and find the best spot that fits you and lock it into the position between your lower part of the thumb and the oposit muscle. The coin is now invisible to your audience and safe from falling out of your hand.

So when the audience is convinced that the coin magicaly dissapeard, you can pop it back in your hand by squeesing it harder. The coin should pop right back in your palm.

For each trick you perform you must use a your creativity to make it more interesting for your audience. Good luck!