Floss is the different thing from my country. Vietnamese usually use bamboo toothpicks which is hard to find in the US.
Moreover, Vietnamese people always take chewing gum instead of breath-strips which is not popular in Vietnam.

Coke is the similar thing to me. I can see coke every where in Viet nam and American. The way Vietnamese and American people drink coke is similar. They drink coke when they are thirsty, especially when they eat fast food.