Political differences, bitter criticism and frequent run-ins have rarely put Prime Minister Narendra Modi and Congress leader Sam Pitroda on the same page. But Diwali brought an unexpected moment of bonhomie, with the Prime Minister reaching out to his long-time critic with a festive greeting, addressing him as "Sam Bhai". The Prime Minister on Thursday wished Indian Overseas Congress chief Sam Pitroda on the occasion of Diwali and Gujarati New Year.