It began somewhere deep inside her barrell-like chest and emerged stuttering at first- a bit like an old fashioned car in winter that just won’t start. It was a low pitched sound, rasping and croaking that got higher and higher as her enjoyment of the joke grew. By the time the punchline was delivered she was inhaling huge breaths, braying like a donkey and almost choking on her own merriment. Her flushed cheeks were soaked as the tears ran down her face. Soon we were all crying with laughter as she infected us with her joy.