Amitabh Bachchan shared a picture on social media riding a bike, and his granddaughter Navya Naveli Nanda posted a comment stating grandpa was the "coolest".In the Instagram picture, Big B is seen riding a bike dressed in a leather jacket and sunglasses."…riding a Harley is a world of its own," Big B captioned the image.Navya Naveli, daughter of the veteran actor's daughter Shweta Bachchan Nanda, wrote with a fire emoji: "The coolest."Big B currently has a huge roster of films lined up. He will be seen in "Brahmastra", "Chehre", "Jhund", "MayDay", "Goodbye" and a remake of the Hollywood film "The Intern", besides an untitled film with Prabhas and Deepika Padukone.