Former Finance Minister and Bharatiya Janata Party (BJP) leader Yashwant Sinha has a wry sense of humour and it was amply on display at a press conference on the 2G telecom spectrum scam where he spoke in his capacity as member of the joint parliamentary committee (JPC) investigating the issue. Greeting journalists ahead of the festival season, he added a word of advice. "Don't burn crackers, Delhi is already very polluted," he said, and added after a tiny pause, "And politically too." Given the politics within the JPC over fixing the blame for the scam, maybe Sinha was only half-joking.