Kissa Tabeez Ka

Gopi and billu find a way to reduce Chautala's anger. They meet a baba who claims that if Gopi and Billu buy a locket from him and wear, she will never get angry at them. Gopi and Billu buy the locket and to their surprise every time she is about to get angry they show the locket and she gets pacified.What is the secret of the locket?