7. When laying your chopsticks down, do not lay your chopsticks parallel on the top of the bowl or leave them sticking in the bowl. It is considered rude and a sign of bad luck.
Instead you are to leave your chopsticks on the chopstick holder. You may also leave it resting diagonally on the plate, which is perhaps closest to western etiquette. Do not drop your chopsticks; it is considered bad luck.
Sticking your chopsticks straight up in your rice bowl is rude, since they will resemble the joss sticks used in religious ceremonies.