Critical Mass: 4 Wheels Not 2

Every so often, probably about once a week, I hear what sounds like skateboarders going down the street in front of the hotel. By the time I care enough to get up and look, I see nothing but a taxi or two passing by. Tonight, around 23:30, I heard the same noise. This time I was already standing up so there was no excuse not to go to the window. I was right, there was a big group of skateboarders skating down the middle of the street, a la Critical Mass except with far fewer participants. Perhaps they are making some noise to protest the plans to take away some prime skateboarding real estate in front of Barcelona's Museum of Contemporary Art. That plaza, with it's long and low-slung stone (not really sure of the material) bench in front of the museum with nothing but an expanse of uncluttered concrete in front of it, is a skateboarder's paradise. Or perhaps they just like irritating the people in cars by skateboarding down a main thoroughfare.