You can see a lot standing in the checkout line at Walmart.
Waiting patiently, your mind occupied while you run through your to-do list for the rest of the day, you are abruptly jolted back into reality by a preschooler. A four-year-old boy directly in line in front of you has decided he desperately needs a candy bar… now. His mom, baby in one arm and a basket of groceries hanging on the other, qui…