Eight year old boy asks his mother how old she is.
She replies, "It's none of your business."
He asks how tall she is, and how much she weighs. She replies the same.
He asks why she and Daddy got divorced.
The same reply.
He goes out to play with his friend and relates the incident. His friend tells him he can get that information off of his mother's drivers license.
Later, after sneaking into her purse, the young boy confronts his mother. "Mother, you are 30 years old, you're 5'4" tall and weigh 135 pounds!!"
"Well, smarty pants," she replies, "If you're so smart, why did your dad and I get divorce?"
"That's easy! You got an "F" in Sex!!"