A guy says to his friend, "Guess how many coins I have in my pocket."
路人甲对路人乙说，"猜猜我兜里有几个子儿？"
The friend says, "If I guess right, will you give me one of them?"
路人乙说："我猜对了，你能给我一个不？"
The first guy says, "If you guess right, I'll give you both of them！"
路人甲说："你要猜对了，我两个全部给你！"