The Ordeal of Fruit

Two men shipwrecked on an Island are captured by cannibals. The cheif informs them the only way to avoid becoming dinner is to undergo the'Ordeal of fruit'. The men accept at once and the cheif tells them to go into the forest and collect 100 pieces of fruit and bring them back to him. The first man comes back with 100 grapes. The cheif says that if he can shove all of the grapes up his ass without laughing he will be released from the island. But no sooner than the first grape has reached his ass he bursts out laughing 'Whats so funny?' the cheif asks 'You do know we will kill you now?' 'Im sorry' the man says. 'Its just that my friend is collecting pineapples'.