In 1922, in Dallas, during the Dixie Classic, the forerunner to the Cotton Bowl, an Aggie, E. King Gil, was called from the stands to suit up as a substitute. Hence the phrase, "12th Man"

Even if A&M didn't possess the federal trademarks that it does, it would still have rights to the idea by commonlaw. As you can see, the real 12th man has been around for generations, when did the Seahawks become a team? The Aggies also stand through the entire 60 minutes of every football game, just as Gil was the last one standing on the sidelines during the Dixie Classic, do they do that in Seattle (If so, that is impressive for a pro team)? While I've never been to Qwest Field, and without blowing smoke up anyone's ass, I'm pretty sure that Kyle Field is bigger and louder, with a capacity of well over 90,000.