This article's content is accurate to the most recent public game version, 0.4.8d.
"Are you of legal drinking age?"
Using Questionable Alcohol heals 350 HP of one party member, which in most cases is enough for a full heal... or at least coming very close. The downside is that doing this also has a 25% chance for the character to be 
Confused and/or 
Poisoned afterward.
Questionable Alcohol can be found in the Cafeteria freezers every three nights, on rotation with Gob-Gob Pudding and Loli Cola.