[Tsuwabuki]

Natto.

No, seriously. The only thing that I have issues with is the few Japanese people I run into every so often where they have a disconnect with my ability to speak Japanese and refuse to speak to me in anything but broken English. When I am running to catch a train or plane, or have something to get done, I'm not willing to give an English lesson. If my Japanese is better than your English, let's just be about it.

This was much more of an issue in Korea, though. Where I was constantly engaged in conversations solely for English lessons. It made me very protective of my time, and less tolerant of individuals unwilling to engage me in their own language.