"15 minutes could save you 15 percent." It's a well-known tagline for Geico, perhaps one of the most recognized ones currently on air. The insurance giant capitalizes on this for two new spots out of The Martin Agency, by positioning the tagline as a well-known fact, but adding on two, strange facts you might not know: that owls aren't always wise, and Old MacDonald was a terrible speller. Read more about Geico's burgeoning growth at AdAge.com.