"A WORK OF GENIUS" --Chris Evans Learn the most beautiful skill from an expert in making children laugh, Michael Rosen Jokes, a jack-in-the-box, jelly, and jumping beans make children laugh. 
As do practical jokes, peekaboo, pantomime and poetry that makes no sense. 
Why and how does this work? And why does it matter? 
Writer and Professor of Children's Literature Michael Rosen, whose books - from 
We're Going on a Bear Hunt to 
Chocolate Cake - have made millions of children rock with laughter, gives us the tools for this greatest of gifts.