Cultural differences are what makes us all unique and what greatly contributes to the excitement of travelling when you get to discover some particularities of a destination that aren't too or at all common in your home country. Eating rotten fish might sound slightly (and literally) off to you, but it’s totally normal in Sweden. Having two passports from the same country is common in Russia, but might not exist where you live. And the practice of eating fried Mars bars might not be the most popular one in North America, but it’s common in Scotland, or seeing police driving Lamborghini as their work car in Italy might not be seen anywhere else.