Well, here are my picks although I don't think you can find any similar domestic counterparts here in America (thankfully 8-p).
1) Natto
Although that may be something exclusive to Japan I think as it is certainly not available here).
2) Basashi
Sorry, horse meat just doesn't appeal to my palate--especially when served raw. Tried it once, and even when smothered in soy sauce, the overpowing flavor of the meat is just a little too strong for my tastes.
3) Sakana no Ikizukuri
Somehow, I prefer not to see my meal squirming around my plate while I eat it... 'nuff said (the fish was certainly fresh though 8-p)
4) Pretty much any dish involving Kujira meat or any of its by-products as an ingredient with "Kujira Jiru" being the worst imho. Somehow, salted blubber from a whale made into a soup just doesn't cut it for me. 8-p
Don't get me wrong, i'm all for trying new things (actually developed a taste for snake meat as a result of my travels abroad through China and India) and i've tried all of the aforementioned dishes at least once before deciding it wasn't for me. I can take the fried grasshoppers, the raw squid served with kimchee as an appetizer (actually pretty tasty), and pretty much anything else, but those are the ones that come to mind atm. I'm also not a fan of unagi (eel) dishes, especially when served shirayaki style although I can eat it and maybe i've just never had it served properly.
