Approach the volunteer with a smile on your face and your right hand extended as if about to give a handshake.
Drop your right hand at the last second and instead grab his extended wrist with your left hand. This interruption of a routine gets his mind racing to process the situation.
Lift his right hand up before his face, creating the feeling of a threat.
Turn the volunteer's hand so his palm is facing him.
Look from his hand to his eyes, conveying a facial expression that implies something is amiss.
Watch his eyes for the sign they are beginning to glaze over, then jerk his hand down and shout "Sleep!"
Reach out and catch the individual as he will go limp if you were successful, and you should not let him fall as he could be hurt.
Speak comforting words to the individual as soon as you catch him, telling him that he is in a place of peace and everything is okay. You only have a brief window after the interruption induction before his brain processes the situation and starts up normally again to begin the hypnotic state.