Bill Clinton’s trick at the funeral wasn’t laughing. At a good funeral you can laugh at the good memories of a friend. His problem was that he saw the camera and immediately switched to tearful mourning even while the person he was with was still laughing. He is an emotional chameleon. Hillary tries, like with the contemptuous laughing at questions she doesn’t like, but she is not a natural at it like Bill.
Bill was caught on camera doing that. It was somewhat disturbing.