Joseph,
What about up to the point of ad she haim throw up? That’s when my friends, Chaim Berlin parents, put a stop to it. The sight of their 15-year old son coming home from celebrating with his fellow bchorim throwing up violently and sick to his stomach made them realize that teen agers had no clue where the line of ad dlo yoda was. Over the next few yearts he stayed home, under their supervision as to how much he could drink.