A famous hypnotist was performing in a large auditorium full of students one night.

He began to speak in a soft and steady voice over the loud-speaker system. "Listen to the sound of my voice...", he kept repeating, "the sound of my voice... every word is a command... the sound of my voice..."

Pretty soon, he had every single student in the audience completely mesmerized, each one hanging on his every word.

Needing to go out for a moment, he announced "I will have to leave the stage for a moment, but you will all remain in a trance while I am gone". And then he repeated the words "the sound of my voice... every word is a command."

As he turned to go, he tripped over the microphone cord, landed on his butt, and yelled "SHIT!"