nightline: We go behind the scenes tonight at Groupon, one of the fastest growing companies in the world, and perhaps one of the quirkiest. In the clip above, 29-year-old CEO Andrew Mason takes Chris Bury on a tour of “Michael’s Room,” a place where writers can go to relax, get inspired, and ride one very interesting bicycle. IS THAT THE FUCK YEAH SHARKS LOGO ON THE WALL? IT IS. WE’VE...