Sack Escape - Trick

Just for RJP because you will see the humor in this

A magician is handcuffed by a member of the audience. He is then placed in a sack, the mouth of which is tied, above his head by any person present. The bag with the magician is placed into a curtained endclosure. The magician's assistant enters the curtained enclosure and at the count of three, the curtains are drawn away. To the utter surprise of everyone present there, the performer emerges free and his assistant is found tied inside the sack only which three seconds ago was occupied by the performer.

The sack is made of thin but strong material with a plain cord running through the metal eyelets about 8" apart around the top. The size of the sack is approximatley 48" high by about 40" wide. 3 meters of nylon rope is included for tying the mouth of the sack. Handcuffs and curtain NOT included.