Book excerpt: Laughter guaranteed with The Ha Ha Bonk Book by Janet and Allan Ahlberg - jam-packed with brilliant jokes to tell your dad, your mum, your baby brother, your teacher and anybody else you can think of, such as: What goes ha ha bonk? A man laughing his head off. and What goes 99 bonk? A centipede with a wooden leg and What goes putt, putt, putt, putt, putt, putt, putt, putt? A bad golfer and lots more besides! This is an all-time classic favourite joke book for all the family to enjoy. Allan Ahlberg - a former teacher, postman, plumber's mate and gravedigger - is in the super-league of children's writers with sales exceeding 17 million and library borrowings of 13 million. In collaboration with his late wife, Janet, he has published many enduring titles, among them Each Peach Pear Plum, Peepo!, Burglar Bill and The Jolly Postman. In addition he has written novels, collections of stories, sets of easy-readers and joke books.