be undefeated in multiple Super Bowls, having each won two. Among the 12 teams who have not won a Super Bowl, the AFC's Cleveland Browns, Houston Texans, and Jacksonville Jaguars, and the NFC's Detroit Lions are the only four to have not appeared in the game. The Super Bowl is among the world's most-watched single sporting events and frequently commands the largest audience among all American broadcasts during the year. It is second only to the UEFA Champions League final as the most watched annual club sporting event worldwide, and the seven most-watched broadcasts in American television history are Super Bowls. Commercial airtime during the Super Bowl broadcast is the most expensive of the year because of the high viewership, leading to companies regularly developing their most expensive advertisements for the broadcast and commercial viewership becoming an integral part of the event. The Super Bowl is also the second-largest event for American food consumption, behind Thanksgiving dinner. Origin For four decades after its 1920 inception, the NFL successfully fended off several rival leagues. In 1960, the NFL encountered its most serious competitor when the American Football League (AFL) was formed. The AFL vied with the NFL for players and fans. The original "bowl game" was the Rose Bowl Game in Pasadena, California, which was first played in 1902 as the "Tournament East–West football game" as part of the Pasadena Tournament of Roses and moved to the new Rose Bowl Stadium in 1923. The stadium got its name from the fact that the game played there was part of the Tournament of Roses and that it was shaped like a bowl, much like the Yale Bowl in New Haven, Connecticut. The Tournament of Roses football game eventually came to be known as the Rose Bowl Game. Exploiting the Rose Bowl Game's popularity, post-season college football contests were created for Miami (the Orange Bowl), New Orleans (the Sugar Bowl), and El Paso (the Sun Bowl) in 1935, and for Dallas (the Cotton Bowl) in 1937. By the time the first Super Bowl was played, the term "bowl" for any major American football game was well established. After the American Football League's inaugural season, AFL commissioner Joe Foss sent an invitation to the NFL on January 14, 1961, to schedule a "World Playoff" game between the two leagues' champions, beginning with the upcoming 1961 season. The first World Playoff game would have, if