Every country and culture has their own sets of myths, superstitions and beliefs. That with Japan too. There are many things which bring good luck or bad luck according to some beliefs.
Here are a few superstitions of japan:
In Japan, the numbers 4 and 9 are considered to be unlucky. Because of this, there are no 4th floors in Japan. Even if something is to be given its either 3 or 5 but not 4 and it's either 8 or 10 but not 9.
It is believed in Japan that if you sleep with your head facing the north, you will die soon and you have short lifespan. It is because the deceased person are laid at their funeral facing north.
If you see a spider in the morning, that means it is a sign of good luck and you should not kill it. But if you see a spider at night, this means a sign of bad luck and you should kill it.
writing a person's name who is alive with red ink means that the person will have a short lifespan. This is due to names on graveyards being red.
It is believed that these cutting tools have some spirit powers. This is believed in Japan, that if the nails are cut at night, this means that your parents or you will have an early death.
If you want a beautiful baby girl, then you should clean your bathroom. Although, there is no evidence if it actually happens but if you want a baby girl then you can believe in it.
In Japan, it is believed that if you have big earlobes, you will become rich. It is so, because there is one of the Seven gods of fortune in Japan who represents wealth. And he has big earlobes too.
Beckoning cat is known as Maneki Neko in Japan. This is a common figure which can be usually seen at business places. It is believed that a beckoning cat brings good luck to the owner.