It's bad to be short-tempered towards people.
Cindy is buying something in store, and the price shown on the register is more than the price on the shelf.
Cindy wants to pay the lower price.
Cindy asks the cashier to double-check the price and says she thought maybe it was lower on the shelf.
Cindy says with a raised voice that the cashier should be fired for getting the price wrong.
The cashier has the price checked, and Cindy gets the lower price and a coupon for her trouble.
The cashier gets the manager, who charges Cindy the correct price, but tells her she's banned from the store for her outburst.