To work in retail, you've got to have thick elephant skin because boy are you gonna meet some pretty tough customers. Your patience will be continuously tested, and the levels of dumb you'll encounter in a day will surpass anything you could have possibly imagined. These two Karens thought they could outsmart a quick-witted employee who caught on quickly to what they were doing. Using the self-checkout counter, they attempted to walk out with half of the things they had in their cart before act…