The world of public relations has always been about making a splash. And in an age of more and more media clutter, breakthrough ideas have never been more important. To create that can’t-miss-it buzz, this year’s most innovative PR firms paired an A-list Hollywood actor with an A-list Hollywood director, staged a surprise pop-event in a major urban transportation hub, enlisted some of the biggest stars from the booming world of women’s sports, and employed some creative grammar to stir up social media chatter.