The most common differences between foreign customs in Japan is about how to eat noodles.
The Japanese sip noodles.
The sound that is generated at that time is considered vulgar in many countries, and the gap with the image that the Japanese are elegant also confuses foreigners.
I think that this difference in food culture arises from the difference in tableware.
Pasta is served on a flat dish.
For that reason pasta is easy to cool down.
Meanwhile in Japan, noodles are served in Donburi.
It is protected by Donburi and hot soup, and noodles do not decrease in temperature.
How to eat noodles in Japan is to eat while cooling it.
SAYONARA.