Sure, children are the greatest gift of all -- but that doesn't mean you want to be seated next to one on an airplane. From the dawn of time, other people's kids have found ways to spoil things for the rest of us. Movie theaters, parks, restaurants -- every venue that should be a place of refuge and relaxation has instead become a freewheeling playground complete with shrieks, wails, and ill-timed excretions. Now, I Hate Other People's...