What Goes Up White and Comes Down Yellow?

When first I appear I seem mysterious, But when I am explained I am nothing serious. What am I? A RIDDLE! Was that too easy? How about what goes ninety-nine BONK (a centipede with a wooden leg)? Or which famous book was written by Charles Chickens (Great EGGspectations, of course!). In this book you'll find a whole host of amazing riddles. Some will get you head scratching, some will make you laugh, and all are a lot of fun. Plus find out some brilliant riddling facts, and top tips on how to solve the trickiest brain-teasers. Written by Master of Funny and Collector of Riddles Gyles Brandreth, this is the ultimate, riotous Book of Riddles!