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 take a quick piss, 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!"