The current Guinness World Record for loudest crowd roar in a stadium is 142.2 dBA set by the Kansas City Chiefs fans at Arrowhead Stadium on September 29th 2014 on MNF against the New England Patriots. Hey guinnessworldrecords! Join #BillsMafia at Highmark Stadium on Thursday September 17th to witness a new world record for the loudest stadium crowd roar. What do ya say Mafia? Are you up for the challenge? #BuiltInBuffalo #DasBillsBoot #TNF #GoBills