Hákarl (Iceland)

Hákarl delivers an ammonia assault so potent that Anthony Bourdain ranked it as the worst thing he ever ate. Fermented Greenland shark buried for three to six months develops a stench exceeding 130 times the safe human exposure limit for ammonia, reaching 10,000 parts per million. Each bite offers a fishy, chemical burn that surpasses #6 Durian's purely olfactory offense by attacking both smell and taste simultaneously, making it the most repulsive item on this list.