The trouble with participatory journalism is that you have to... er.... participate. Witness Emily Yoffe and the beauty pageant. Or Bill Buford and, er, the pig in the elevator. (Yes, you should read that book. Right now.) It's even tougher when your subject is... THE NFL. Wall Street Journal reporter Stefen Fatsis took on the gridiron — which is just as terrifying as it sounds. But contrary to what you may have thought — he came away with both bruises AND wisdom; ala the great Paper Lion. Questions? Post 'em here.