It's bad to chew loudly with your mouth open.
Stan is out at dinner with his parents at a fancy restaurant and his order of lasagna has just arrived.
Stan wants to enjoy his meal.
Stan quietly and methodically eats his lasagna with a fork and knife.
Stan chews loudly with his mouth open and smacks his lips as he eats the lasagna.
Stan savors his meal and enjoys the dinner with his parents.
Stan is scolded by his parents for being impolite and having bad table manners.