http://www.youtube.com/watch?v=AtnJDZak080&feature=related
It's a fake protest from ImprovAZ. They had signs that were jokes and pretended to protest, all with different sayings, some not even a 'cause' but just a line like "That's what she said!"
I really like this idea, but would not want to copy it. But I like the concept of doing something that you expect to be something else at first sight, but closer up, it is something completely different.