Gross-out humor is as old as human society itself, and so are the toys designed to capitalize on it. From a 1st century Roman Emperor who created an early version of the Whoopee cushion, to cutting edge, modern materials that emulate human body fluids, gross equals big bucks for toymakers. These are the stories of America’s most innovative, groundbreaking, and profitable toys designed to shock–and how they grew to claim a bigger piece of the 100-billion-dollar toy industry than you would think.