A 17-year-old girl became severely ill after eating a chocolate bar containing a medicinal mushroom product that was contaminated with muscimol, a toxic compound from poisonous mushrooms. She experienced confusion, uncontrollable muscle jerks, dilated pupils, and excessive drooling, requiring hospitalization and temporary breathing assistance. Though her symptoms resolved within 8 hours and she recovered fully, this case highlights the serious danger of unregulated mushroom supplements that can be contaminated with deadly toxins.