Last month, Cheerios turned 60, and the cereal had quite a cel-O-bration! Thousands of teenagers clad in yellow shirts met at the Mall of America to form the largest human letter O ever. The birthday bash for the cereal, which was once called Cheerioats, included an appearance by race car driver Richard Petty. And guess which band showed up to sing "Happy Birthday"? Yup, it was O-town. Oh, my!