The ‘Kedarnath’ fame actress appeared on the finale episode of the quiz-based reality show, along with her grandmother, legendary actress Sharmila Tagore. After the host, Amitabh welcomed the duo on the hot seat, Sara said: “Amit sir, knock knock.” The cine icon was left confused and asked what is "knock knock."

Replying to him, Sara said that he has to ask “who's there?” The ‘Brahmastra’ actor nodded to the gorgeous actress and said, “Yes, who's there?” Sara started the banter saying “Watch”, to which Amitabh said, “Watch who?” The ‘Simmba’ actress said laughing, “Watch us win Rs 1 crore.” The ‘Sholay’ actor then asked Sara, “Do you think you're the only one who's popular? I also know knock-knock.” “Knock knock,” said Big B, and Sara replied, “Who's there?” Amitabh said, “Dense,” to which Sara said, “Dense who?” The 81-year-old actor said, "I'm impressed with your ‘confidence’. I hope that you will win crores of rupees today. And the special cause for which you both will play today, it will be donated towards it.”