Card-Shark presents the next great idea of Christoph Borer, the inventor of Get Sharky, Trick of the Year!
This effect involves two books. One has the title "Everything Women know about Men", the other "Everything Men know about Women". When showing the first book, it is obvious that the ladies know everything about the men's lives. But when the other book is shown, all pages are blank, only the page numbers are there. Seemingly not that much knowledge around about women.