After the man finished swapping the cup, he crossed his arms and looked at Aldred. "Pick one."
"It's on the left," Aldred said without the slightest bit of hesitation.
The man frowned. "Are you sure? You don't want to think this through?"
"I am sure. Just pick it up."
The people nearby seemed amused and started to gather around them to watch.
The man grunted and lifted the left cup. And there it was. The small rock lay bare.
The people there cheered and clapped.
"It's not finished. You still need to win one more time."
"Okay." Aldred smiled.
The man put the cup on the rock again as the crowd got bigger. He sneered inside. 'You think I will let you win? What a naive guy. In every casino, the house always win!'
He began swapping the cups left and right again. This time his speed became much faster, and the crowd that tried to find out where the rock was gave up after a few seconds.