i think it might be illegal to knowingly give alcohol to a minor. when we were minors in college, we had a homeless person who use to hang out at the local liquor store buy us our alcohol ( we would buy him a beer) until the cops arrested us for minors in possesion and arrested him for distributing alcohol to a minor ( or some other law).
also, if you are a minor and caught driving under the influence, say goodbye to your license for at least a year.