Sometime in the 1940s an improbable encounter occurred at a mental institution in Maryland. Two women, each of whom was institutionalized for believing she was the Virgin Mary, chanced upon one another and engaged in conversation. They had been chatting for several minutes when the older woman introduced herself as "Mary, Mother of God."

"Why you can't be, my dear," the other patient replied, unable to conceive of such a notion. "You must be crazy. I am the Mother of God."

"I'm afraid it's you who are mixed up," the first asserted, "I am Mary."

A hospital staff member eavesdropped as the two Virgin Marys debated their identities. After a while the women paused to quietly regard one another. Finally, the older patient seemed to arrive at a realization. "If you're Mary," she said, "I must be Anne, your mother." That seemed to settle it, and the reconciled patients embraced. In the following weeks the woman who had conceded her delusion was reported to be much more receptive to treatment, and she was soon considered well enough to be discharged from the hospital.

This clinical anecdote was retold in a 1955 issue of Harper's Magazine, and a highly-regarded social psychologist named Dr. Milton Rokeach read it with great interest. What might happen, he wondered, if a psychologist were to deliberately pair up patients who held directly conflicting identity delusions? Perhaps such psychological leverage could be used to pry at the cracks of an irrational psyche to let in the light of reason. Dr. Rokeach sought and secured a research grant to test his hypothesis, and he began canvassing sanitariums for delusional doppelgängers. Soon he found several suitable subjects: three patients, all in state care, each of whom believed himself to be Jesus Christ. And he saw that it was good.