Beachgoers in South America can have a cold Coke and a smile, but unlike other consumers of the world's most popular soft drink, they can drink it directly from a bottle made entirely of ice. The Atlanta-based company says the “cold to the last drop” bottles "continue to make quite a splash in Colombia and throughout the advertising world." Indeed, the cool marketing ploy, began this year, has won Coca-Cola several awards. How does it work?