My roommate told me of the legend of a ghost named Hanako San. There are a lot of different versions of her, but the one he remembers is of a girl who killed herself in a school bathroom because of bullying, who haunts every school bathroom in Tokyo. Many elementary school children will go into a school bathroom on the third floor, turn off the lights, and knock on the third stall door three times. This is supposed to summon Hanako San. If you hear her respond to the knock, it’s in your best interest to leave. He likened this to the tradition of Bloody Mary in the states. He learned this from other classmates. This ghost could’ve been based on a real girl, or it could have been used to try to prevent kids from bullying others. It’s also a bit of a game, similar to bloody mary. This practice adds some entertainment to a normally dull day in grade school.