Note: To perform this, you need a pencil, a sugar cube and a glass of water.
The effect: Call an audience to show your magic. Ask a volunteer from the audience to pick a number between 1 and 10. Write the number on the sugar cube. Then, drop the cube into a cup of water and say," The cube goes into the cup". Now hold the volunteer's hand over the water. Turn the volunteer's hand over and MAGIC! The number is on the volunteer's hand.
When the volunteer picks the number, write it onto the sugar cube with a pencil (pressing hard). Then, hold the cube between your thumb and one finger and press it as hard as possible so that the number transfers onto your thumb. Next, you put the cube into the water and call your volunteer. When you hold the volunteer's hand above the water, make sure your thumb is in his/her palm so that the impression of the number from your finger is transferred onto the hand of the volunteer.
Tip: Adults would find out your trick easily. So, it would be a good trick to show this magic to smaller kids, who would not be able to figure it out so easily.