Got the idea for this in the "Big E" thread and the rule changes made just because of Eric Williams and his female dog slapping of so many defensive ends. I figure if we all brainstorm, we can come up with a pretty impressive list that highlights how often the league has had to change because of the Cowboys. Probably the most popular recent change made as a result of a Dallas Cowboy was Roy Williams and the horsecollar rule. What other NFL norms were created specifically to counter, adjust, or react to Dallas Cowboys players or coaches? Not just rules, but situational positions, coaching strategies, awards, league finances, anything?