Scary things to do on Halloween...?

Does anyone know have any ideas of scary things to do on Halloween in Tokyo?

Are there any haunted areas?

I dont recommend it...
But there is the Halloween Yamanote party, when a lot�@of the foreigners in tokyo go into the yamanote sen while wearing costumes and organize a little halloween party in the train...

By Wikipedia:

Amiidaji (Temple of Amida) in Dan-no-ura, in the Shimonoseki Strait, is the location of a legendary haunting. It is said that the blind Biwa hōshi Hoichi, a resident of the temple, was visited every night by the ghost of a dead samurai and made to play the biwa in the cemetery, but the priest of the temple soon found out and had the heart sutra painted on every part of Hoichi's body apart from the ears. When the samurai returned one night to take Hoichi to the cemetery, he could only see Hoichi's ears, so he took them instead and Hoichi was left earless. Hoichi is commonly known as ''Mimi-Nashi Hoichi'', ''Hōichi the Earless'', due to this event. This legend was famously retold by Lafcadio Hearn in his Kwaidan: Stories and Studies of Strange Things which was later adapted as part of Masaki Kobayashi's film Kwaidan.

Aokigahara, the forest at the bottom of Mt. Fuji, is a popular location for suicide. This gives rise to a widespread belief that it is haunted.

Okiku's Well at Himeji Castle is often said to be haunted by the ghost of Okiku. She is supposed to rise from the well at night and count to nine before shrieking and returning to the well.

http://en.wikipedia.org/wiki/List_of_reportedly_haunted_locations

These lists contain some places in or near Tokyo.

http://theshadowlands.net/places/japan.htm

http://www.weirdasianews.com/2009/08/19/japans-haunted-places/

Doing scary things and going to haunted places is what the Japanese do in summer, but visiting graveyards at night is a typical idea. You can also read some Yakumo Koizumi novels.
http://en.wikipedia.org/wiki/Lafcadio_Hearn

Sorry, I guess Hearn was already suggested.