The three men take the chief up on his offer.
The chief says to the men, "Bring me back ten pieces of the same type of fruit."
The first guy comes back holding ten apples.
The chief says, "If you can shove all those apples up your ass without changing your facial expression I will let you go."
By the fifth apples it is too unbearable so he gets thrown in a cage for later.
The next guy comes back with 10 grapes. Chief tells him to do the same thing. By the ninth grape the guy starts bursting out laughing.
The other man in the cage asks why he was laughing so hard and he says, "I saw the last guy coming down the hill with 10 Pineapples."