When you're old enough to write a book for children, by then you'll have become a grown up and have lost all your jokeyness. Unless you're an undeveloped adult and still have an enormous amount of childishness in you.
Roald DahlA Message to Children Who Have Read This Book - When you grow up and have children of your own, do please remember something important: a stodgy parent is no fun at all. What a child wants and deserves is a parent who is SPARKY.
Roald Dahl