A boy was going through his gr…

A boy was going through his grandmother’s wallet one night and found her ID card.”Grandma?” he asked,”How much do you weigh?” His grandmother replied, “That’s not an appropriate question, Jimmy” He then asked, “How old are you?” She again replied, “That’s not appropriate, Jimmy.” Finally he asked, “Grandma, why did grandpa leave you?” Before she had time to answer, Jimmy looked at the card and said, “Oh I see, it’s because you got an ‘F’ in sex.”