6 Forgotten Fast Food Items That Were Actually Dangerous

2. Taco Bell’s ‘Volcano Taco’ – Lava Sauce Burns

This red‑shelled taco came coated in a mysterious “lava sauce” that was supposed to be spicy. Instead, customers reported actual chemical burns on their lips and tongues, with one woman posting a photo of her blistered mouth that went viral. Taco Bell insisted the sauce was safe, but the taco vanished from menus after less than a year.