The sky is falling in Dallas and David Buehler is lucky to be alive. Buehler was sprinting across the Dallas Cowboys' indoor practice arena when the roof of the facility suddenly collapsed. A metal pole crashed into his head causing a concussion, ripping skin off his ear and gashing his knee that would require stitches. According to Dallas Morning News, Buehler said: "My initial thought was, how many people are dead in this?...I thought I was the lucky one." And Buehler was rig...