This is another of those Cirque Du Soleil specials featuring beautiful images of people who are more physically fit than you doing things that you can't believe a human being can do. In that sense, they're a lot like most porn. This one's a sing-along, inviting you to sing along with songs you don't know, often in languages you don't speak. So not only will you not be able to do anything the performers do physically, you won't be able to do what the chorus does, either…