When Coca-Cola discovered that part of its classic logo looks like the Danish flag, the brand (or at least agency McCann Copenhagen) decided to make an interactive airport ad that dispenses flags. Why? Apparently it's a Danish tradition to greet arriving travelers by waving flags, and Coke wanted to help make a bigger show of the fact that passengers were arriving in Denmark, ranked as "the happiest country in the world." You can watch the results in the case study below. I personally doubt this hidden flag was a real "discovery" on Coke's part so much as a forced connection, but it's a nice gesture.