Your grandpa was a svelte boss. You, by comparison, are a junk-gobbling slob, according to a slick new split-screen ad for Coca-Cola from agency David in Buenos Aires. The spot, part of a larger effort to position Coke as anti-obesity, is meant to compare granddad's modest approach to life with today's steady diet of too much everything: oversized sandwiches, lattes and pre-TV-dinner hot dogs. Don't cut out Coca-Cola, though. Sugar water is cool, so long as you're riding your bike to work and taking the stairs. Because no matter what, it's important to enjoy life, and sugar water—or maybe aspartame water—is clearly the key to happiness.