Forget clovers or kisses — St. Paddy's day just wouldn't be the same without Guinness. The Irish stout has been a longtime symbol of the celebration, and for good reason. No doubt part of that has to do with its clever, amusing, and memorable ads, many of which are just as famous as the brew itself. The company's major campaigns didn't kick off until the 1930s but have been going strong ever since. In honor of the holiday, we've rounded up some of our favorites. Take a look, and pick up a pint!