What does a stage hypnotist do?

Everyone knows that some kind of trickery, some kind of machine, wires, whatever you want, was actually involved in creating the illusion of flight. Well, www.iconversationalhypnosis.com says that a stage hypnotist’s job is to create the illusion of control. Think about the
very first thing that a stage hypnotist does. He invites people to come up on stage. He invites volunteers. So who’s going to volunteer to that? The person who doesn’t want to ‘cluck’ like a chicken? The person who doesn’t want to make a fool of himself?