In The Wizard of Oz, Dorothy and her traveling companions embark on the Yellow Brick Road in search of the great and powerful Oz. Dorothy believes she can't return to Kansas without the help of the wizard who resides in the Emerald City.
"I am Oz!" the wizard bellows when Dorothy finally gains an audience with him. But the gig is up once Toto reveals that the wizard is simply a man barking into a microphone and pulling a bunch of levers. That creates the illusion of an intimidating and all-powerful wizard.
"Pay no attention to that man behind the curtain!" the man implores.
To no avail.
"You're a very bad man," Dorothy scolds.
"Oh, no my dear. I'm a very good man," the man pleads. "Just a very bad wizard."
Turns out, he wasn't a wizard at all. Just Oscar Diggs of Omaha, NE. With no special powers to brag of.
A moment of dénouement is a signature of all good films, plays and literature.