In western nations, making noise while you eat is considered annoying and improper, but it's the opposite in the East. In Asian countries, loudly slurping your soup or noodles is a compliment to the chef.
Although giving someone a thumbs up is a sign of affirmation or approval in many places, the people of Italy, Greece, Nigeria, Afghanistan, and Iran will not be so pleased to see it. In these countries, the gesture translates to "up yours," and is seen as very offensive.
Even though being "fashionably late" has become a trend in America, Americans still recognize that the polite thing to do is to show up on time for a planned event. This isn't the case in Argentina. Showing up on time there is seen as rude. Instead, guests are supposed to show up 30 to 60 minutes late.