Japanese etiquette is rather complicated with many prohibitions: you should not move the dishes, leave food with a bite taken out of it, pierce through the food, pour drinks yourself, and so on. However, you are allowed to chomp while eating noodles: this way you are showing that you like the food. The Japanese talk about food and how tasty it is all the time. It is highly impolite to eat without repeating “oishii“ (”tasty") several times. They like repetitions in general in Japan, especially if it is a girl who repeats a word (they think this is very sweet).