All I think of when I see or hear about the "Running of the Bulls" in Pamplona, Spain is the opening scene of the movie City Slickers. It's all fun until someone really gets hurt and more than a couple usually does each year.
Wearing adult-sized diapers may be a strange way to voice your disapproval, but the infant-inspired getup will definitely get you noticed.
At least it did for a group in Valencia, Spain who continue raising their voices against social spending cuts and austerity measures put in place by the government there.