His mom's purse

So this kid is going through his mom’s purse and he takes out her driver’s license. His mom catches him reading it and just mildly scolds him.

The kid says, "But I learned so much about you from it."

She says, "Well, okay, what did you learn about me?"

"Well,” says the kid... “I know your age now."

"And what is that?" asks his mother.

"You're old," says the kid.

"And I learned your height."

"Which is?”

"You’re really tall," he says.

"Well, yes, I am tall for a woman."

"And, I learned your weight,"

"And what is that?" asks the mother.

"A lot for a woman your height."

The mother sighs and says, "Well, that's not nice, but I can't argue that."

"And," the kid says, "I know why dad divorced you."

"Huh? What?" says the mother. "How on earth did you get that from a drivers license?"

"Because, you got an 'F' in sex."