Why are the kids that screw around on the football team doing better?

Why are the kids that screwed around on the football team doing better at not screwing around? What I think is that our coaches have been running us harder than usual. And also that they have a reason for running us harder and thats because of the kid always screwing around. But our football team hasnt screwed up in a while because the kids that do screw around dont want to run for their mistakes, and therefore they dont screw around because they don't want to work hard during practice. Also they have not been screwing around because one of our coaches said that if we do something really good in a football game we get pizza, and therefore the kids that screw around try to do better so they can get pizza to. And by them not screwing around this leads to an easier practice, our coaches are nicer to us, and we are all nicer to eachother.