Two pilots are flying over a jungle when the plane is shot down. 
The two pilots bail out before the plane explodes and parachute to safety.
The two men land on the middle of the jungle and look around.  All of a
sudden they realize that they are surrounded by cannibals.

The cannibals take the pilots to their chief.  The chief says, "You
gonna be dinner tonight."  The pilots got on their knees and begged for
mercy.
The chief said, "If you passum bravery test you live.  If you fail, you
dinner."
The two men agree to the challenge.
The chief said, "You go into jungle and pick 100 piece of fruit and come
back.
The two pilots run into the jungle and start picking fruit.  The first
pilot returns with 100 grapes.  The chief said, "Now we see if you pass
bravery test.  You have to shove all 100 pieces of fruit up ass without
laughing.
You laugh, you dinner."  The pilot drops his pants and proceeds to shove the
grapes up his ass.

Before he could get the first grape up his ass he started to bust out
laughing.
The chief said, "You laugh, now you die."  The chief said, "Why you
laugh."

The pilot said, "I can't help it. The other pilot is out there picking
pineapples."