His father -- babuji to his sons -- explained to Amitabh that his hand was aching from writing all through the night, and he hoped that the warm water would soothe it.
"I was puzzled," Amitabh recalled chuckling. "Babuji wrote with his left hand."
The senior Bachchan told Amitabh that he had used the willpower to transfer the pain to the right hand.
"And that meant he could continue writing with his left hand and take care of his right hand at the same time," Amitabh said.
Of the many things he has taken from his father was his discipline, a sense of integrity and humility, the actor told the 1,200 strong crowd, most of who had paid $150, to attend the tribute to his father.