Sales Tax
Where did sales tax even come from? Many European and Asian countries don't implement it in retail or food shopping. The sales tax is never a part of the initial price of the item, which makes pretty much no sense. And it varies from state to state to make it even more confusing.
Saying "Restroom"
What's wrong with "bathroom," "toilet," "water closet," or anything other than restroom? Why are people so weird about talking about the bathroom? In other countries, the term "restroom" is just confusing and conjures up images of a bedroom. There's no need to be shy!