A few examples of popular Japanese good anad bad luck superstitions
If you sneeze, someone will gossip about you.
If you whistle at night, robbers will come to your home.
If you cut your nails at night, your parents will die in a short time.
If you point at ambulances or graveyards, you will have bad luck.
If you see a funeral car, hide your thumb.
The number four is considered bad luck by all Japans.
If you find a white snake, you will be lucky in life.
If you put your head to the north when you sleep, you will have bad luck.
If you kill a snake, you will lose your money.