Do you push doors marked Pull and pull doors marked Push? Do you automatically turn round when someone shouts 'hey stupid!'? Do you think that being able to stuff your mouth full of marshmallows is a sign of superior intelligence? Score one point for each 'yes' answer: 3: You are extremely stupid. You will love this book. 1-2: You are fairly stupid. You will love this book. 0: You think you're really smart but deep down you're as stupid as the rest of us. You will love this book.