Show a beautiful wooden frame empty inside and is open, front and back. Blow up a balloon (e.g., yellow) and place it inside the frame. Take two pocket handkerchiefs (e.g., red) and place one through a hole in the right side of the frame - do the same with the other hankie through a hole in the left side of the frame. Show a third handkerchief (yellow) and it vanishes mysteriously!
Stick a pin in the yellow balloon and then POW! The yellow handkerchief suddenly appears TIED BETWEEN the two red hankies magically!
Looks really great, and is a big surprise for the audience!