It's rampant in Walmart but it's certainly not confined there. I regularly post photo safari's here myself, hotels, restaurants and college visits have all been recent non Walmart hunting grounds. . .  They are disgusting, and they are EVERYWHERE!!!  The %'s go up the farther and farther you get away from the downtown/uptown area, and by the time you get out to the country, you are dealing with a majority of people who are big fat nasty motherfuckers.