Surströmming (Sweden)

Surströmming is the world's most potent canned food, with a stench so aggressive that opening a tin indoors forces immediate evacuation in 90% of cases — multiple airlines banned it as a safety hazard. This fermented Baltic herring registers a pH of 3.2 after months in brine, creating gases that distort the can. Its ammonia-rich odor outranks #2 Balut in sheer olfactory assault, as the egg's pungency merely approaches the fish's sustained intensity. Measured at over 8,000 AU on the Schmidt Stink Scale, Surströmming surpasses the average spoiled fish by 150%, earning a flight ban from Lufthansa and KLM since 2019.