A Connecticut Yankee in King Arthurs Court by Mark Twain Chapter 24 Page 20

It had not occurred to anybody in the crowd — that simple trick of inquiring about somebody who wasn’t ten thousand miles away. The magician was hit hard; it was an emergency that had never happened in his experience before, and it corked him; he didn’t know how to meet it. He looked stunned, confused; he couldn’t say a word. “Come,” I said, “what are you waiting for? Is it possible you can answer up, right off, and tell what anybody on the other side of the earth is doing, and yet can’t tell what a person is doing who isn’t three yards from you? Persons behind me know what I am doing with my right hand — they will indorse you if you tell correctly.” He was still dumb.

“Very well, I’ll tell you why you don’t speak up and tell; it is