Update: The Chiefs eventually did break the record!
RECORD BROKEN! 137.5 DECIBELS! #LoudAndProud— Kansas City Chiefs (@KCChiefs) October 13, 2013
YOU GONNA TAKE THAT SEAHAWKS FANS?!?!?! (Oh, also, KC is 6-0.)
Earlier this year,the Seattle Seahawks set a Guinness World Record for loudest sports crowd, reaching 136.6 decibels in a game against the 49ers. The Kansas City Chiefs hoped to break that record at Arrowhead Stadium this Sunday against the Raiders, announcing a Guinness representative would be on hand for the game.
Apparently, it got louder: