Need to catch a taxi in Australia, New Zealand, Scotland or Holland? Things are different there and you are supposed to sit by the driver, or they will feel you are showing them they are worse than you. You can see that also in some parts of Ireland.
#17 like in other parts of the world, you don't go prowling through someone's fridge when you're invited.
#20 Not in France. Well it is gross everywhere, but that will shock no one if you decide to empty your nostrils into a tissue.
#22 Yeah no, Russia again. It's considered impolite to not finish your plate.