A hard-working supermarket clerk is bagging groceries at the end of the express checkout lane. He's doing a good job, but an impatient customer checks her watch and starts to criticize.
"Hurry up," the customer harps. "I don't have all day."
Rude customers are nothing new, especially in a grocery store located on a busy street in New York. What makes this scenario so objectionable is that the person bagging groceries has Down syndrome, and the customer starts to use indefensible language.