What Goes Up White and Comes Down Yellow?

*A brand-new book of amazing, mind-boggling riddles, from the much-loved Gyles Brandreth, author of What's Black and White and Red All Over*
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!
'Very funny and often outright silly' Guardian on Have You Eaten Grandma by Gyles Brandreth