which has never occurred. Since the Ravens joined the gauntlet in 1996, no team has successfully run the bird gauntlet; the most recent to fail was the 2022 New Orleans Saints. Boise Rule: A rule instituted by the NFL in 2011 banning non-green playing surfaces. "Boise" refers to Albertsons Stadium (then known as Bronco Stadium), the home field of Boise State University, famous for its blue playing surface. The rule was viewed as a reaction to potential sponsor influence, as no NFL team had considered adopting a non-green surface. The Duke: A nickname for the late Wellington Mara, longtime owner of the New York Giants. The nickname stems from the Duke of Wellington, an actual English hereditary title. This nickname was extended to the official game ball used by the NFL "The Duke" named in honor of Mr. Mara. To this day one can notice the moniker "THE DUKE." branded into every official NFL football just to the left of the NFL Shield. (In Denver, the same nickname was given to quarterback John Elway, after a teammate noticed that his walk to the huddle before The Drive in 1987 looked like John Wayne's.) Harbaugh Bowl: Rare games when brothers John and Jim Harbaugh, both NFL head coaches, met as opponents, which included Super Bowl XLVII, the first Super Bowl in which brothers were opposing coaches. The games have also been given nicknames like the "HarBowl". Ickey Shuffle: Dance done by Cincinnati Bengals running back Ickey Woods whenever he scored a touchdown. Woods was forced to move the dance to the sidelines behind the Bengals' bench after officials starting penalizing him for unsportsmanlike conduct. K-Gun: Nickname referring to the no-huddle offense used by the Buffalo Bills with quarterback Jim Kelly during the late 1980s and early to mid-1990s. The K in K-Gun comes from "Killer", the nickname given to Kelly's teammate Keith McKeller. Lambeau Leap: During home games at Lambeau Field, some players from the Green Bay Packers would leap into the stands after scoring a touchdown. Originally created by LeRoy Butler, it was made popular by Robert Brooks. Players in other stadiums imitate the leap. Manning Bowl: Rare games when quarterback brothers Peyton (formerly of the Indianapolis Colts and Denver Broncos) and Eli Manning (New York Giants) met as opponents. Mile High Salute: A touchdown celebration used by Denver Broncos running back Terrell Davis during his playing career, in which