Have you ever been travelling and when you're lining up to have your passport stamped, wondered why you're passport is a different colour to everyone else's?
Some people's passports are red, others are green and there there are a select few that are either black or white, so what's the deal?
Why can you only get passports in these colours?
Why is the Australian passport navy blue and not ruby red?
Well, Hrant Boghossian, the vice president of marketing at financial advisory firm Arton Capital, which runs the Passport Index website, has some answers for us.
Take note of these facts because they'll be great to pop out at the next dinner party you go too.
So, let's start with our Australian passport, why did we go with navy blue?
A lot of countries use blue passports including the United States, Canada, Hong Kong, many countries across Africa, Central and South America, and various island nations in the Pacific.
They many not all be the same shade of navy blue, but they all use some shade of the colour.
Hrant told The Telegraph that blue passports are used to represent "New World" countries, countries that way back when, were discovered by European explorers.
The shade used for each passport simply depends on the nation's preference, so maybe Fiji just prefers sky blue over navy blue?!
Red passports are very popular in Europe and Hrant says that there are two reasons for that.
He explained that "some could argue that the burgundy red is due to a past communist history" however, these days, a red passport signifies that a country is part of the European Union (EU).
After Brexit, UK Prime Minister Theresa May announced in December that British passports will change from red to blue, as the public voted to leave the EU.
Conversely, Turkey changed their passports from black to burgundy in an attempt to join the EU!
Hrant explained that green passports are mainly used by Islamic states.
"Most Islamic states use green passports because of the importance of the colour in their religion."
Green is believed to be the favourite colour of the Prophet Mohammed and is associated with paradise in The Koran.
Egypt, Indonesia, Vietnam, Mexico, Nigeria, Zimbabwe, Saudi Arabia, Morocco, Pakistan, South Korea and the Ivory Coast are among the nations with green passports.
You may have noticed that New Zealanders use a black passport and funnily enough, is only of only a few countries in the world that does so.
New Zealand uses black on its passport as it is a colour of significance in the culture, as is silver.
The only other countries currently using black passports are the Palestinian Territories and Hrant says that the reason why so little countries tend to use black passports is simply because of national preference and cultural significance, which Hrant says, many governments tend to ignore.
"Governments around the world have the freedom to choose the colour and design.
"Unfortunately, only few have understood the importance of this document on their country’s brand identity."
Well, there you go, now you'll understand why the French passport looks slightly more Regal than the culturally appropriate New Zealand passport.