Weird Bike Wednesday - Bicycle Built for Three

That guy in front doesn't look comfortable

This week's weird bicycle comes from Bikewrter's Blog. Now I have seen triple bicycles before, and generally they look just like a tandem, but with another saddle and set of pedals. I don't understand this contraption. The guy in front looks really uncomfortable. The one in the middle looks like he has a pretty normal configuration, while the guy in the back looks like he's setting in a super-sized child seat, and holding onto weird handlebars. What really confuses me is that there appears to be only one crank. Are they all try trying to pedal one crank? I don't see how that can work very well.