Let's say you walk into a restaurant and order a meal with some alcoholic beverages. At the end of the dinner you pay for your meal and exit the restaurant, leaving some leftover alcoholic drinks on the table. Right after you leave, a teenager approaches the table and drinks the remaining alcohol.
In this scenario, who will be responsible for supplying alcohol to a minor? The person who ordered the meal? The restaurant itself? The teenager, for "stealing" the alcohol?