Advertisements and jingles have a way of getting stuck in our heads for days, and sometimes they're so catchy we always have them in the back of our minds. From the McDonald's saying "I'm lovin' it" to Wendy's "Where's the beef?" some campaigns stick with us for years to come long after they're off the air. So goes the story with "Got milk?" which debuted in 1994, and is now officially back.