What is a common method for a server to check whether a drinker is sober?

The common method for a server to check whether a drinker is sober involves observing their behavior, speech, and physical coordination. This approach allows servers to assess how a person is functioning in real-time, which is crucial in a social environment like a bar or restaurant.

When servers pay attention to signs such as slurred speech, erratic movements, difficulty maintaining balance, or changes in social behavior, they can make a more informed decision about the drinker's level of sobriety. This method is not only practical but also quickly applicable in the busy atmosphere of establishments like Dave and Buster's, where immediate observations can guide service decisions.

Other options, while they may be humorous or imaginative, are not usual practices for assessing sobriety. Asking someone to sing a song can be entertaining but does not provide reliable insights into their sobriety state. Similarly, giving a math quiz is impractical, as the mental stress of the task might not accurately reflect a person's intoxication level. Providing a breathalyzer test is a more formal approach that might not be available or appropriate in all settings, making the observational method the most commonly used and effective for servers in this context.