At restaurants in France, Italy, Spain, and Japan, asking for any alterations to the dish you're ordering is rude

In Italy, not drinking a cappuccino after eating is impolite

In Japan, people might stare at you for eating in public

Having one hand in your pocket is bad manners (in Turkey and South Korea)

In Greece, West Africa and some Middle Eastern countries, giving someone a thumbs up is impolite

In some parts of China, it's nice to make the "horn sign" when greeting someone. It's an old tradition that dates back to the 5th Century and it is related to the belief that dragons have horns

In Japan, laughing loudly with an open mouth is considered impolite

Not sitting in the back of a taxi is bad manners in Australia, New Zealand, Ireland, and Scotland

in France, it's inappropriate to bite or slice into a baguette

In Vietnam, it's polite to cross your fingers when you see a person who is celebrating their birthday, because it means good luck

In UK, it's offensive to show two fingers with the palm of your hand facing towards you

In Mexico, People might get upset with you for arriving exactly on time

In some asian countries, blowing your nose in an open public area is ok