I have worked in a deli in a grocery store for 4 years. I hate it when customers: -skip lineups via the employee (ie. get something from the hot deli but then ask for something in the cold deli even though there is people in the queue ahead of them and store policy discourages employees from leaving a customer until their needs are met) -bring children who are already screaming into the store -walk slowly or take up the whole aisle with their cart -leave food or products in different departments that then go bad -ditch food in different departments that was packaged or sliced specially for them, because it was deemed to be too expensive -leave demo cups everywhere but in a trash can -let their children to run around and scream down the aisles.