Seahawks football fans, and the team, take pride in the Seattle Rattle
"The 12th man"
From the Seattle Seahawks NFL football team website:
“Sunday, November 27th 2005 in a dramatic overtime win, the Seahawks defeated the New York Giants who were called for 11 false start penalties and 3 missed field goals — Courtesy of the 12th MAN’s vocal support. Coach Mike Holmgren dedicated the game ball to the 12th MAN the following day. The ball, now known as the 12th MAN Ball, resides in the Wells Fargo Club.