There are several ad slogans that seem to live rent-free in Americans' brains: "Just do it," "I'm lovin' it," or "You're in good hands." You can probably guess the brands just from hearing those ...

As she was putting away her goods, she reached for a can of evaporated milk. Then, she reached for something deep in her memory – a slogan. "I couldn't get their attention," Ernst said.

Those phrases belong to Coca-Cola. That's the power of a good slogan. They're designed to stay with you (seemingly endless repetition through commercials and billboards don't hurt either).