What kinds of Japanese foods are good to eat?

And don't say the boring, average-Joe type of stuff, like sushi or chicken katsu. I've already tried all of those. Say something new and interesting. Something that not many people, or Americans, have never heard of or tried; especially, if you've been to Japan and experienced all the various types of cuisines and delicacies there. The most intriguing type of food that I've heard of would have to be okonomiyaki. Its a type of Japanese pancake made with savory fillings, such as bacon, noodles, eggs, pork, etc. I've never tried it, but it sounds delicious. I would like to travel to Japan one day and try the different types of foods they have there, so please feel free to give suggestions.