I had her hooked. "You mean it? It really was a trick after all?" she said, slumping.
"It sure wasn't PC," I said. "Let me show you."
"At the lab," Shari said. "I'll be there in ten minutes."
A couple graduate students were there, fooling around with Rhine cards when we arrived, and Shari chased them out without ceremony. She locked the door behind them. We were to have privacy. She didn't bother with her lab coat this time.
"Show me," she insisted.
"The apparatus, Shari," I grinned. She gave me a deck of cards, and pulled out the two of hearts and two of spades.
"We'll do it face-up," I said. "So you can see how it's done!"
I laid the two cards side by side on her blotter, face up. "Now put a finger on each one." I directed. "And watch them like a hawk. What card is under your right forefinger?"
"Heart," Shari said.
"Wrong," I told her. "Spade."