Having been a primary teacher all my long working life, I've dealt with many 'class clowns', and knew that their daft behaviour was always a means of hiding misdemeanours or shortcomings. Boris seems to me to put on his 'lovable buffoon' act when he's flustered or put on the spot by a searching question.
In my opinion, a leader, statesman, President. Prime Minister etc should at least possess the quality of dignity. That's why I really liked Obama and detested Trump.