Do not pass food someone using chopsticks. It is a bad luck because it is parallel to the passing the cremated bones of a deceased relative at a Japanese funeral.
When you share a plate, use the reverse side of chopsticks to avoid double dipping.
Do not bite into a piece of food and place back to a plate. You cut food on a plate and then picked up and eat all at once.
Use chopstick holder to rest your chopstick when you are not using it and place it directly in front of you parallel and holding side on a right.
Do no make wasabi soup with your soy sauce. Wasabi paralyzes your palette.
Do not dip sushi rice-side-down into the soy sauce, and let the sauce soak up into the rice. The soy sauce is not to flavor the rice but the fish. Dip the sushi rice-rice up in the soy sauce and carry to the mouth.
Do not wave chopstick to call somebody. Chopstick is for foods.
Do not chew the chopstick end. It is a bad manner.
