During the Sept. 15 showdown, fans at CenturyLink Field -- the loudest stadium in the NFL -- might break the Guinness World Record for "loudest crowd roar at a sports stadium."
The current record in this category of 131.76 decibels, according to SeattlePI.com, was set at the Ali Sami Yen Sport Complex Turk Telekom Arena on March 18, 2011, in Istanbul, Turkey, by fans of Turkey's Galatasaray S.K. club. (That is the other kind of football, for those not familiar.)
Considering how loud Seahawks fans are without a record on the line, we'd be silly to bet against them.