This is very true. I will one story I heard from my grandfather.
He said he had 2 friends who were tendering cows on a grassy hill. Sam was being playful that he hit the cow's butt, and he can't get his fist out of the cow's butt.So the cow ran away dragging him, and John was laughing at his friend being dragged by the cow while his fist still attached to the cow's behind... He was laughing so hard that his jaw locked upon and he had the difficulty in breathing.After Sam managed to forcibly take his fist out of the cow's body, he goes back to the place where John was, and he found his friend lifeless.He died .cause of death was "laughing so hard".