Laughter is an interior convulsion, producing a distortion of the features and accompanied by inarticulate noises. It is infectious and, though intermittent, incurable.
There is nothing in the world so irresistibly contagious as laughter and good humor.
The beauty of the world, which is so soon to perish, has two edges, one of laughter, one of anguish, cutting the heart asunder.
Perhaps I know why it is man alone who laughs , he alone suffers so deeply that he had to invent laughter.
The human race has only one really effective weapon and that is laughter.