Bend five toothpicks in half so that they crack.
Place the toothpicks on the middle of a table so the middle of each toothpick touch and the ends point out.
Tell your audience you will make the toothpicks form a star without ever touching them.
Give them a chance to "move the toothpicks" to make a star before you show them the trick. Tell them they have to form a star without ever touching the toothpicks.
Drop a small amount of water onto the middle of the toothpicks. The wood absorbs the water and forces the middles out. The result is ends of each toothpick meet to form a star.