Bartenders agree that anger and frustration looms large when a customer questions the amount of alcohol in a drink, so this answer would be answered "correctly" when the interviewee honestly states their reaction and talks about their customer service follow-up. An "incorrect" answer would include either:

☛ Confronting the customer and making a scene (you do not want prima-donna bartenders on your staff)

☛ Overpouring the next drink (that would be another form of bartender theft)

Because your bar's reputation is built on the strength of the customer service you and your bartenders offer, make sure that the person you are interviewing understands that the most important thing to do when a customer is unhappy is to respond politely, but firmly.