A boy goes on a fishing trip with his grandpa. They install themselves on the river bank and have brought with them all the provisions they need for a fine day's fishing.
After a while, grandpa lights a cigarette. The boy gazes on. He knows his parents won't allow him to smoke, but he gets on well with his grandpa, so he asks:
- Can I have one of those cigarettes?
Grandpa, knowing he shouldn't encourage the boy in a bad habit, but not wanting give a curt "no" asks:
- Does your dick reach your ass?
The boy replies:
- No , it doesn't.
- Then - said grandpa - you aren't old enough to smoke.
Half an hour later grandpa opens a six pack. The boy has always wanted to taste beer so he asks grandpa for a swig.
- Does your dick reach your ass? - asks the old man.
- No - replies the boy.
- Then you're not big enough to touch beer - comes the reply.
By and by the boy feels hungry and opens his lunch box. He finds a pack of cookies there and takes one out to eat it. Grandpa sees this and fancies a cookie himself, so he asks for one.
The boy turns the tables on his grandpa and asks:
- Does you dick reach your ass?
- It sure does - says the old man.
- Then go fuck yourself - These are all mine!