Picking Fruit

Two guys sneak into a farmer's fruit garden and start eating the fruit. The farmer sees them and comes out with a shotgun. "Since you guys like fruit so much go pick 100 of which ever fruit you want," said the farmer.
The first guy decides to pick grapes. When he gets 100 he goes back to the farmer.
The farmer says,"now shove em' all up your ass."
The guy gets all 100 up his ass. He feels really bad, but then e starts to laugh.
"Why you laughing?" asked the farmer.
To which the man replied, "My friend is out picking watermelons!"