There are three guys and a cannibal. The cannibal says you have to complete this task or else I will eat you. "Go into the forest and collect 10 of the same fruit and bring them back to me". The first guy comes back with 10 apples. The cannibal says "okay, if you can shove all 10 of those apples up your butt without making a sound, I won't eat you." So the guy shoves the first one up but when he gets to the second one he screams and gets eaten.
The second guy comes back with 10 berries. The cannibal tells him to shove all 10 berries up his butt without making a sound. The guy gets to the ninth berry and starts to laugh, so the cannibal eats him.
The first guy and the second guy meet up in heaven. The first guy says, "you were so close, why did you laugh?" Then the second guy responds, "I saw the third guy coming with watermelons."