The Yankees-Red Sox rivalry is the biggest among all sports, or at least among United States-based sports teams. Everyone knows how much they do not like each other and a buzz always builds whenever they play.
This is a funny commercial that plays on the Boston-New York rivalry.
I will admit that the only soccer I really watch is during the World Cup. I have quite a few friends that love soccer and try to sell me on why it is the most popular sport in the world. I still cannot see it, but I am trying.
With that said, this is a cool commercial by Nike in anticipation of the 2010 World Cup. (Thanks to Brooks Peck at Yahoo! for this one.)