In some Asian countries, slurping during a meal is a sign of appreciation for the person who prepared it. In Turkey, on the other hand, haggling at bazaars is not only a way to get a better price, but also an important part of local culture.
These are just two examples, and there are many more similar customs worldwide. Often, something that seems completely natural to us may be perceived as disrespectful in another country.
However, it is precisely this discovery of the world and its diverse traditions that makes every journey even more fascinating.