Well, Suuuuumimasen.

In some countries, it's perfectly acceptable to make bodily contact with strangers. Things can get crowded and stuff happens. You might find yourself being shoved into a subway car, your thighs getting intimately familiar with the contents of a stranger's pockets. Or you punch someone in the face during a soccer riot. That's just the way it is. I'm not judging. I'm celebrating the moments of our lives.

But that's not how it works here, to my knowledge. You bump into somebody, and there's a certain ritual that ensues:

BUMPER: Oops, excuse me. Sorry.
BUMPEE: Excuse me.
or
BUMPEE: That's OK.
or
BUMPEE: [discreet silence]

Nowhere is it prescribed that someone bumps into you, yells, "Owww!" you say "I'm sorry!" although it CLEARLY was not your fault, they make pain face, you say sorry again and then mention the fact that THEY bumped into YOU and then they look at you while rubbing their arm that's in a cast [which clearly should be more carefully protected by the owner and not be bandied about, in an athletic setting, all willy-nilly], LADY AT THE GYM TODAY. Grr.