“Choose your letter, Watson,” he retorted. “You and I are on terms that make flattery impossible. Is it F, J, P, Q, or Z?”
He fixed his eye penetratingly upon me. It seemed for the moment as if I were hypnotized, and as his gaze fairly stabbed me with its intensity, through my mind there ran the suggestion “Choose J, choose J, choose J.” To choose J became an obsession. To relieve my mind, I turned my eye from his and looked at the fire. Each flame took on the form of the letter J. I left my chair and walked to the window and looked out. The lamp-posts were twisted into the shape of the letter J. I returned, sat down, gulped down my brandy-and-soda, and looked up at the portraits of Holmes’s ancestors on the wall. They were all J’s. But I was resolved never to yield, and I gasped out, desperately,
“Z!”
“Thanks,” he said, calmly. “Z be it. I thought you would. Reflex hypnotism, my dear Watson, is my forte. If I wish a man to choose Q, B takes hold upon him. If I wish him to choose K, A fills his mind. Have you ever observed how the mind of man repels a suggestion and flees to something else, merely that it may demonstrate its independence of another mind? Now I have been suggesting J to you, and you have chosen Z—”
“You misunderstood me,” I cried, desperately. “I did not say Z; I said P.”
“Quite so,” said he, with an inward chuckle. “P was the letter I wished you to choose. If you had insisted upon Z, I should really have been embarrassed. See!” he added. He removed the green-ended box that rested in the pigeon-hole marked Z, and, opening it, disclosed an emptiness.
“I’ve never had a Z case. But P,” he observed, quietly, “is another thing altogether.”