Good Business
I went to a Japanese Buffet a few nights ago. The place was located in the richer side of town, and was quite upscale. I could tell it was posh because their bathrooms were clean and they kept the place dimly lit (I don't understand why expensive places are always darkly lit, surely they can manage to pay the electricity bills.).
As we were walking in, I noticed that one of the waitresses was speaking to a customer in Cantonese. I thought it a bit strange at first, considering it was a Japanese restaurant, but realized that it was not unheard of for Japanese people to speak Cantonese. But later on I overheard the two sushi chefs joking to each other in Cantonese. One might assume that the staff were simply multilingual and familiar with many different tongues, but the ease with which the chefs spoke Cantonese and the fact that they spoke it for conversing rather then Japanese or English, would seem to imply that Cantonese and not Japanese was their native tongue. Also, I have never met a Japanese man with the surname "Hong," because "Hong" is a distinctly Chinese name (although to be fair, he could have been of Chinese descent but grew up in Japan).