In Italy, don’t ask for Parmesan cheese on your pasta:
In Italy, Parmesan cheese is traditionally only used as a finishing touch for certain dishes. Asking for Parmesan cheese on your pasta is considered bad manners, as it implies that the chef’s seasoning is not good enough.
In the Middle East, it’s impolite to use your left hand to eat:
In the Middle East, it’s impolite to use your left hand to eat because it’s considered unclean. The left hand is typically used for personal hygiene and should not be used for handling food.