Stefan and his grandfather

Stefan and his grandfather are fishing.
Grandad pulls out a beer and the little boy says: "Grandpa, can I have one of those?"
Grandpa says:

"Is your penis big enough to touch your asshole?", to which the little boy responds: "No."
"Then you can't have one."
A while later, the Grandad pulls out a cigar and the boy asks: "Can I have one of those?"
Grandpa says: "Is your penis big enough to touch your asshole?", to which the little boy responds: "No."
"Then you can't have one."
Later on, Grandpa and Grandson go to the grocery store for food and each buy a lottery ticket.
Grandpa is unlucky, but the little boy says: "I just won $50,000"
Grandpa says: "Great, your going to split that with me, right?"
The little boy asks: "Grandpa, is your penis long enough to touch your asshole?"
"Yes," says Grandpa. To which the little boy responds: "Then go fuck yourself !!!"