Sometimes a man has to do what a man has to do and should not have any shame in his actions. I had to go number 2 one time during a game in high school. It was either make a mad dash off the field in front of everybody looking like Forest Gump in the process or crap your pants right there in the red zone. Caught hell about it for weeks from team mates and fans but the alternative would have been worse. Porta Johns on the side lines would be a great improvement and a source of confidence for just such emergencies to players and coaches but NFL Officals would have to inspect them before the games to make sure no illegal contrand was stashed away for deceitful purposes.