The real name of the online celebrity of canned flying fish is Surstromming. Canned herring is one of the most unpleasant foods in the world. It is listed in Sweden in the summer around August every year. By mid-August, the herring in the can became sticky and juicy, and the gas in the can also expanded due to the fermentation of the herring, which made the can bulge, which meant that the herring had been cured.