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

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

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

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

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

In Italy, not drinking a cappuccino after eating is impolite

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

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

It's inappropriate to expose the soles of your feet in most Arab, Hindu, Muslim and Buddhist countries

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 the USA, you might offend waiters by raising your hand when they walk by you

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

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