What Goes Up White and Comes Down Yellow? - Master of Funny

*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!).