"Knock Knock." "Who's there?" "Figs." "Figs who?" "Figs the doorbell, it's broken " Illustrations bring the silliness to a whole new level in this book of knock knock jokes kids love. Every joke is illustrated Kids LOVE knock knock jokes, and this illustrated book by the New York Times-bestselling creators of the Happiness Is . . . project will leave them in stitches The World's Best Knock Knock Jokes for Kids...