What you need to prepare
Glass with thin smooth walls, filled to the brim with water.
Take a glass in his hand and held to the eyes. Look through it on the fingers of the other hand.
In the glass you will see a very long and thin fingers without a brush. Turn the hand, fingers up, and they will turn into a funny little man.
Take the glass away from the eyes, and the glass will have all the brush, but it is very small and on the side, as if you moved your hand.
Call mom, look at each other through the glass and not have to go into the room with laughter.