Nurikabe

In the folklore of the Japanese island of Kyushu, the nurikabe is the “wall poltergeist.” It appears as a large white wall in front of people who are out walking about late at night. If you try to pass the wall, it will fall on you and crush you. If you turn and run from it, it will reappear in front of you. The only way to escape is to hit the bottom of the wall with a stick, and it will disappear. 

The Encyclopedia of Ghosts and Spirits – Written by Rosemary Ellen Guiley  – September 1, 2007