these parts, is not electric, it ain't gas. oh, man, are you kidding me? it's human power. >> yes. every bit of it. >> an absolutely insanely dangerous closely choreographed process of first getting the heavily laden wheel in motion and getting it up to top speed and keeping it there. wow. look at this thing tilting out, too. >> then it goes the other way. >> note to footwear, by the way. it's not just this one, every coming blocks bigger and bigger, each one with its own troupe of spinners. going for a ride is tempting, but -- >> host of cnn implicated in death of four underage carnies.