contact
Mail a letter - Since Vatican City is a separate country, it also has its own postal system, which is generally considered to be a bit more reliable than that of Italy. Send a postcard to your friends and it will be postmarked from Vatican City.
respect
Since Vatican City is a Papal state, such respect and reverence to the Roman Catholic Church and its practices and doctrine is encouraged.
Sleeveless shirts and short pants or skirts are not permitted within the border of the Vatican.
talk
Latin enthusiasts rejoice! There is one country in the world that holds Latin in addition to Italian as its official language, and the able traveller is invited to check out the urban legend that you can indeed get by within the city state only using the "dead" language. Italian, however, remains the more useful of the two. English is widely spoken here, as are most major languages of the world—this is the Vatican, a city for the world's Catholics and all who wish to see St. Peter's Basilica.