The boy ran through the store, his toy guns making a racket. As clerks tried to corral him, his father emptied the cash registers.
“There’s your receipt,” Laura said in a bored, friendly way. “Thank you for shopping at MacKenna’s today.”
“You forgot my change,” the customer said.
“Yes, I gave you a $20 bill and the total is $17.22; I should get $2.78 in change.”
“Oh, right.” Laura’s chin began to quiver. “Not again,” she moaned softly. “Um… Look.” She paused and tried to keep from crying. “Look, I’m really sorry, but I can’t give it to you.”