When you can't outrun them and can't fight effectively, you learn it's best not to needlessly provoke them.

Another good response is to glare at the intrusive person and say "Kisama! Omae o korosu!"

Babelfish won't even *try* to translate that (I tried both Japanese and Chinese as the "from" languages). So what, pray tell, is that in English?

I'd hate to find out the hard way that it was something like "Kurite moju trubku!" or worse yet "Hou ni ma de bi!" (there may be some accented characters missing from that last one)