If a customer is used to tipping it becomes almost second nature. If a customer is used to tipping as a general exit strategy, the notion of reward for extra special service becomes rather less of as issue. Perhaps at times, the tip is in recognition that the server is in some way underpaid, so it is to right a wrong. Some passengers tip as an entry strategy. It is a message to the server to be attentive and that there is a promise for more to come. Some passengers identify a key individual, such as a head waiter, as the person to direct this entry strategy towards. Passengers are generally happy to pay a set amount per day as a service charge and to pay a percentage on top of all bar bills but some inevitably decline and act to remove the service charge because they think it is either unfair to them or not what they want to do.