Argentines devour innards and wash them down with Fernet
While not the most adventurous eaters, Argentines love blood sausage, and mollejas (sweetbreads) are also a parrilla (grill) favorite. To wash it all down, they’ll guzzle Fernet mixed with Coke. (The aperitif Campari is another choice beverage, especially during summer). Develop a genuine appreciation for bits you wouldn’t eat at home and you’ll be the most celebrated foreigner to ever attend an asado (barbecue).
Also, always say yes to mate, a bitter caffeinated yerba drink that’s as much a cultural tradition and social bonding opportunity as anything else.
The Spanish is not what you learned in high school Armed with a 10th-grade level of Español, you’d be proud to ask your friend how old he is, by saying: "Cuántos años tienes tú?" Well, that’s not how it’s done in Argentina, where the Spanish is almost another language ("Cuantos años tenés vos?", FYI). The Spanish here is a mash-up with Italian that's got its own world of slang and its own “you” conjugation form, while the double-L sound that normally sounds like a Y (as in calle) sounds more like a “shh” sound. So instead of crossing a cay-yay, you're crossing a cay-shay. Good luck with that...
As if that weren’t hard enough, Argentines also often talk in vesre, in which syllables are swapped like Pig Latin. Vesre, for example, comes from flipping the syllables of the word revés (reverse). Telo, for example, comes from the vesre of “hotel”. Confused yet? I still am sometimes, four years later.