“Maman told me that every time you smile, a very tiny bit of the smile stays stuck to your face, so as you get older and older your face starts to show all the tiny bits of all your smiles and you look like you are smiling all the time, even when you are just thinking about what to have for breakfast. She said, also, that if you frown a lot then the frown sticks to your face instead. That way when you are old you have a very frowny face and look cross all the time and people are scared of you.”