Martin Heidegger, whom many believe to be the greatest philosopher of the 20th century (he is impenetrable, I find, though I once understood his main point for about half an hour, until my mind crumbled), laughed only once. That was when, on a picnic in the Hartz mountains, Ernst Jünger bent over to pick up a sauerkraut roll, and split his lederhosen with a tremendous crack. But after ‘a fierce shout of mirth’, Heidegger checked himself, and ‘his expression reverted to its habitual ferocity’.Having lived in England, I can tell he's trying to be funny because he used the word sauerkraut while talking about Germans.