Bar Surya, in London, was the first, and now there's Club Watt in Rotterdam.  These are sustainable nightclubs, from the low-flush toilets to the bar counters made of recycled cell phones.  But the most ingenius part is the dance floor itself:  it's made of special crystals that repurpose the dancers' energy into the air-conditioning system.  As the London club owner describes it:  "As people dance, the crystals are pressed together, it creates a current, the current then powers the electricity which powers up the light, and the air conditioning."  Just another nightclub fad?  Perhaps.  But any company who thinks green measures are just targeting a fringe consumer needs to take notice, now that even partiers just trying to let loose on a Saturday night are choosing sustainable options.  See http://www.sustainabledanceclub.com/ for more information.