Paul of octopus is a topic during world cup 2010 in Japan. It is surprising talent (Is it a coincidence?)
Octopus 蛸 is one of well-known ingredients in Japan. We eat some mollusks, octopus or squid for traditional Japanese food.
Takoyaki たこやき is very popular food for us. Originally it is a food of Osaka, west area (Kansai area) in Japan. It is eaten in Tokyo now. (I think culture of west and east, Osaka and Tokyo, is very different.)
Takoyaki is a grilled dumpling and small piece of boiled octopus (tako). It is very Japanese worcestershire sauce, mayonnaise, a piece of dried bonito (Katsuobishi), and dried green laver (aonori) are put on takoyaki. Combination of these flavoring is excellent. *Aonori あおのり is one of seaweed.
When I was a child, takoyaki didn't prevailed in Tokyo. I had never eaten it. However we can eat anywhere in Japan now.
If you visit Osaka, you must try to eat Takoyaki and Oconomiyaki. They become typical Japanese cuisine.