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Legend has it that five-clawed pigs are the result of humans being mistakenly reincarnated into pig fetuses, so they have five claws. When such pigs are born, their owners cannot raise them or kill them. They will be sent to the mountains and left to fend for themselves. Those who do not follow the rules will be punished. This is also a taboo for pig butchers.

I once heard that a family raised a five-clawed pig. On the day of killing the pig, several people who did not believe in fate came to help. Among them, the man who boiled water laughed the craziest, and the man who held the knife kept saying unpleasant words.
After the pig is killed, the tied pig's trotters need to be released. After cutting the rope with a knife, the bouncing pig's trotters just hit the knife cutting the rope and wiped the neck of the man who was boiling water. He died on the spot.

There are many folk tales like this. I believe you have heard of them in many areas. Although you have to believe in science, it is true that there are many things that cannot be explained by science. The traditions left by the older generation have a certain reason.