This week on our Summer Series, we look at the wild and crazy world of Viral Videos. Some brands spend big money on videos and nobody watches, meanwhile a cat video is viewed by millions. It's a world with no rules, fueled by luck and timing. We'll look at the most-viewed videos ever, including one a woman made when she quit her job that attracted almost 10 million views, the Evian bottled water video that got into the Guinness Book of World Records, a Nivea viral video that might have gone too far, and a Dove video that broke the Evian world record. These days, marketers can't necessarily spend their way to consumer attention, they have to earn it. And Viral Videos can be just the ticket.