He and his coworker, Sheila, were at Shake Shake in Brooklyn. They had both ordered cheeseburgers, fries, and shakes. He had ordered a coffee shake. She had ordered a chocolate shake. Their buzzer sounded. He went to the pick-up counter. He brought their orders back to their table. The cups containing the shakes were identical. Neither cup was marked Chocolate or Coffee. He didn't know which one was his. He removed the lids from both cups. He looked at the shakes. One was light brown. The other was lighter brown. He asked, "Which one's coffee?” Sheila didn't know. He took both shakes back to the counter. He asked a worker, "Can you help me? Which one's coffee, and which one's chocolate?" The worker studied the shakes. Pointing, she said, "This one's coffee." He asked, "How can you tell?" She said, "Because it looks more like coffee than the other one."