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. 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.