While it’s customary for Americans to hop into the back of a cab, in Australia, New Zealand, parts of Ireland, Scotland, and the Netherlands, it’s considered rude not to ride shotgun. Whereas cabbies in the US will sigh and reluctantly move their newspapers and lunches from the front seat, in other countries it’s a matter of egality.
3. Throwing a thumbs up
In a lot of countries, especially in the Middle East, Latin America, Western Africa, Russia and Greece, a thumbs up basically has the same meaning as holding up a middle finger does for Americans.
4. Laughing with your mouth open