Final answer:
Pointing to the restroom is typically acceptable; however, a more personalized service may be better in a hospitality setting. The long restroom lines at the party mentioned in 'Drink and Flush' are due to the diuretic effect of alcohol.
Step-by-step explanation:
When a guest asks where the restroom is, pointing them in the right direction is generally considered acceptable. However, in a hospitality setting, it might be preferable to provide a more personalized service by either escorting them or giving clear verbal directions along with the gesture. The appropriateness of merely pointing can vary based on the context and cultural expectations.
In the case study titled Drink and Flush, the observation that restroom lines get longer as the night progresses at a party where alcoholic beverages are consumed is linked to the diuretic effect of alcohol. Alcohol inhibits the release of vasopressin, also known as anti-diuretic hormone, which leads to an increase in urine production. This is why facilities like ballparks, where alcohol is often consumed, regularly experience long lines for the restrooms.