Best seller gently critiques rude shoppers
                                
                                
                                    (Newser) -
                                    After 8 years of being ignored, a French grocery store cashier has forced bad-mannered shoppers to take notice. Anne Sam's best-seller, Tribulations of a Cashier, has become a sensation, with comic book, movie, and musical adaptations forthcoming, the Washington Post reports. And Sam has quit her day job to write,...