Funny Dirty Joke

A boy goes to live with his grandparents. It seems the boy's grandma is always making food for the boy's grandpa. One morning the boy walks in on his grandpa enjoying a breakfast his grandmother made. The boy asks, "Can I have some of your bacon grandpa?"
The grandpa then asks the boy, "Can your dick reach your ass yet?" The boy says, "No." "Well there's your answer," he tells the boy.
Around lunch the boy asks for more food, and gets the same response. Then yet again at dinner, only to still get asked, "Is your dick long enough to reach your ass yet?" And the boy still replies, "No," and he knows he is not getting any food from his grandpa. Right before bed, the boys grandma bakes him some cookies. The boy's grandpa walks in and asks, "Hey those look like some mighty fine cookies boy. Can I have one?" The boy then gets a shit eating grin on his face and asks, "Is your dick long enough to reach your ass yet?" The boy's grandpa replies, "Why yes it is," with a sense of pride. The boy tells his grandpa, "Good, go f*ck yourself, grandma made these cookies for me.