when a cashier is talking to someone else whilst ringing up your items at the supermarket. Some one just did this to me and made a mistake because of this. She entered 11 tomatoes instead of 1 which is a pretty big difference and she just kept going, Luckily I was paying attention to the total amount and got confusd why the amount jumped up so high so I asked her to check the tomatoes again and when we looked at the receipt realized she had entered the wrong amount. Which means if I was shopping with my baby and paying attention to the baby I would have paid for 11 tomatoes even though I only bought one, And wouldnt have realized til I checked the receipt at home.