Don't eat anything, even fries, with your hands at a meal in Chile.
Manners here are a little more formal than many other South American countries. So while it might be the most practical to just pick up those fries with your fingers, don't do it. "The greater need is to identify with European culture, so food is (eaten) with a knife and a fork," Allen says.
In Korea, if an older person offers you a drink, lift your glass to receive it with both hands.
Doing so is a sign of respect for elders, an important tenet of Korean culture. After receiving the pour with both hands, you should turn your head away and take a discreet sip, says Stephen Cha-Kim, a Korean-born worker's rights advocate who regularly visits family in Korea. "To this day, if anybody hands me anything, both hands shoot out instinctively," Cha-Kim says. Similarly, don't start eating until the eldest male has done so (and don't leave the table until that person is finished).
Never mix—or turn down—vodka in Russia.
The beverage is always drunk neat—and no, not even with ice. Adding anything is seen as polluting the drink's purity (unless the mixer is beer, which produces a formidable beverage known as yorsh). But there's another faux pas that's even worse, says Allen: when you're offered the drink and you turn it down. Since offering someone a drink is a sign of trust and friendship, it's a good idea to take it. Even if it is 9 a.m.
When drinking coffee with Bedouins in the Middle East, shake the cup at the end.
Typically, anyone Bedouin—or Bedouin-related—will continue to pour you more coffee once you've finished unless you shake the cup, meaning tilting the cup two or three times, when you hand it back. It's such an important tip, says Middle East-based freelance correspondent Haley Sweetland Edwards, that last year, Bedouins she was eating with in Qatar made her practice it until she got it right.
In Brazil, play your tokens wisely.
At a churrascaria, or a Brazilian steakhouse, servers circle with cuts of meat and diners use tokens to place an order. If a server comes out with something you want, make sure your token, which you'll have at your table, has the green side up. If you don't want any more, flip it with the red side up. Since the meat can be never-ending, it's important to strategize—if you leave that token green side up you could end up ordering a lot more than you intended.