Just make sure to do it after you get the food...

[cstaylor]

...wouldn't want something special in that Natto, would you?

[kamome]

I stay away from waitresses and other girls on the job. They generally have no interest in getting hit on by customers. This is especially true in bars/restaurants where gaijin tend to congregate. The waitresses/bar girls get hit on all the time by other gaijin dudes. Thus your odds might be higher in restaurants and bars not generally frequented by gaijin. Even so, why hit on a waitress when there are so many other venues with higher chances of success to pull chicks?