You make a piece of foil float with your mind! This illusion is very easy. Get a piece of thread that is very thin so that it is hard to see. Also you will need tape. Crumble a piece of aluminum foil or tinfoil around the thread. Tape an end of the thread to a table and put the other end in your mouth. Lean back a few inches with the string in your mouth and the foil will apear to float.