Talking Too Much_英语笑话

eight-year-old nina brought her report card home from school. her marks were good...mostly a's and a couple of b's.
however, her teacher had written across the bottom: "nina is a smart little girl, but she has one fault. she talks too much in school. i have an idea i am going to try, which i think may break her of the habit."
nina's dad signed her report card, putting a note on the back: "please let me know if your idea works on nina because i would like to try it out on her mother."