This potential scenario is why I think the European Court of Justice did German wine cooperative Deutsches Weintor a favour when it ordered them to change their labels a few weeks ago. The labels described the wine as bekömmlich, which translates as "easily digestible" or "wholesome." But EU law prohibits companies from making health claims about alcoholic products. The company argued unsuccessfully in its defense that the word was not a health claim but instead referred to general well-being, and was easier to digest because it contained reduced acidity.
Seems to me that the EU Court has saved the company from future lawsuits by hungover customers who found out the hard way that the wine wasn't so easily digestible after all, but it did get them drunk.