"Big B" and "Small B" stand, both literally and figuratively, for Amitabh Bachchan and Abhishek Bachchan respectively. Amitabh is walking tall. Abhishek is... well.., tall! Amitabh is an icon. Abhishek has married an icon! Amitabh adores his son. Abhishek deifies his dad! Never has Bollywood seen a Baap-Beta who are more mutually agreeable than Amitabh and Abhi. So much in agreement with each other that they even reversed roles on screen: Amitabh as "Munna" and Abhi as his "Paa"!