Biographer David Michaelis, author of Schulz and Peanuts, says that cartoonist Charles Schulz was “a man who could neither forget nor forgive any slight or lonely moment. Not for a minute did he believe that ‘Happiness was a warm puppy’ – and he may not have believed in happiness at all. He thought it was impossible to draw a happy comic strip and actually he was fond of saying that ‘Happiness is a sad song’.”