3 guys and a fruit farmer

There were once 3 guys named Bob, Joe, and Jack. They were all
walking through a field when they came across this sign that
said: THIS PROPERTY BELONGS TO A HOMICIDAL FRUIT FARMER.
TRESPASSERS WILL BE KILLED!
The 3 guys ignored it, thought it was just crap. They were
walking for a few more minutes when suddenly they heard a gun
shot, they all froze and saw this little farmer with a shot gun
running at them.
He yelled at them, "Didn't you see the damn sign?! Now I have to
kill all of you!"
The 3 guys were completely freaked.
"But I'll give you a chance," the farmer continued, "choose a
fruit and shove it up your ass, if you don't laugh I let you
live."
Bob went first, he had some cherries, he shoved them up his
butt, laughed and was immediately blown away.
Joe came up next with a n orange, shoved it up his butt, laughed
and was killed by the farmer.
The two guys meet in heaven. Joe asks Bob, "Why did you laugh?"
Bob replied, "It tickled, why did you laugh?"
"Well," Joe replied stiffling a giggle, "because I saw Jack
running up with a watermelon!"