Seattle Seahawk fans set a new world record for crowd noise in football in the summer of 2013, shouting their way to 136.6 decibels. A month later, the Kansas City Chiefs beat the record, producing a deafening 137.5 decibels of sound. The Chiefs’ official Twitter later account exclaimed: “BROKEN RECORD! #LoudandProud.” On Facebook, one Chiefs fan wrote,” Be LOUD AND …