Donald Tusk like Charles Strasburger! The head of government joked on the neo-TVP Info air in liquidation, but nobody laughed

Donald Tusk was a guest of the "Question of the Day" program aired on neo-TVP info. He answered the highly hard questions of the journalist, in which she incarnated - with large skill - an worker of the strategical Resource of the Civic Platform, Justyna Dobrosz-Oracz. The head of government made a fewer jokes, although no 1 in the studio had the courage to laugh. Why?