This little boy was out shopping with his grandmother, and he looked up and asked her, "How old are you, Grandma?"

She said, "Oh, Johnnie, you must never ask a lady how old she is. That's not a very nice question for a little boy
to ask a lady."

"Well, how much you weigh, Grandma?" he persisted.

"No, no, Johnnie, nice boys don't ask ladies how much they weigh."

After a little pause, he looked up and he said, "Grandma, tell me then why you and Grandpa don't sleep together."

"Now, Johnnie, that certainly is not something you should ask about," she reprimanded him.

After a while, when the grandmother paid for a purchase with a check, the clerk asked for her driver's licence. The little boy had an opportunity to see it, and when they walked off, he pulled his grandmother's hand, and proudly acclaimed, "I know how old you are, Grandma; you're fifty-five years old."

"How do you know that?" asked the grandmother.

"I saw it on your driver's license."

"Well, you must not tell anyone," she cautioned.

"I know how much you weigh too - 175 pounds."

"How do you know that," asked the grandmother.

"I saw it on your driver's licence."

"Okay, smarty pants. I ought to punish you for being so nosy, But you better not ever tell anybody how much I weigh."

"I know why you and Grandpa don't sleep together too."

"Well, there's no way you tell that from my driver's licence," she laughed.

"Yes, I could too," he insisted.

"Okay. How could you tell that from my driver's licence why Grandpa and I don't sleep together?"

"Cause you got an 'F' in sex."