When players exit the cramped visiting locker room inside Kansas City's Arrowhead Stadium, make their way down a narrow hallway and prepare to enter the field to face the Chiefs, they are greeted with a stern reminder of what they are about to face.
It's more of a warning, really. The message is plastered on the wall that faces the hallway's exit: "Welcome to Arrowhead -- The Loudest Stadium in the World -- 142.2 DB."
The last part is a reference to Guinness measuring the decibel level in 2014 and declaring it a world record.