Harshvardhan Nawathe, who won ₹1 crore in the first season of 'Kaun Banega Crorepati', has said Amitabh Bachchan, show's host, interacted with him for an hour after the show. "Feeling of me having won...had not sunk in," he added. "He told me, 'You don't know what you've done. You've to be very careful, take care of...parents and yourself'," Harshvardhan said.