And now, how does the trick work?
Attach the safety pin near your shoulder and allow the cord to run down the length of your arm without being seen.
Position the fishing line loop on the palm of your hand, around the middle finger and under the fingernail.
Move your arm a bit to get used to the feel of the cord.
Now place the coin in the palm of your other hand.
Move the hand with the hidden magnet over the coin and as soon as the coin has attached itself to the magnet, close both hands.
Let the loop slide off your finger so that the coin on the elastic cord can disappear - whoosch! - under the arms of your clothing.
Watch the video to get a clear idea of what is meant!