Teaching your kids how to tend bar, including when to cut someone off, is a valuable life skill.~<p>My personal opinion is that to prevent party-related mishaps later in life--particularly between the ages of 18 and 22--you need to teach your kids how to party responsibly <i>before</i> they leave your household.  Thanks to the keen foresight of federal highway funding bills, this means you will almost invariably have to break the law in order to protect your kids in the US.<p>An ounce of prevention is worth a pound of not having to visit the cop shop or emergency department--or both--because your kid never learned about the potential dangers of satyrs and maenads before running off and joining the bacchanalia.