Spectator involvement Spectators at the 1906 unofficial Olympic Games Main article: Spectator sport The competition element of sport, along with the aesthetic appeal of some sports, result in the popularity of people attending to watch sport being played. This has led to the specific phenomenon of spectator sport. Both amateur and professional sports attract spectators, both in person at the sport venue, and through broadcast media including radio, television and internet broadcast. Both attendance in person and viewing remotely can incur a sometimes substantial charge, such as an entrance ticket, or pay-per-view television broadcast. It is common for popular sports to attract large broadcast audiences, leading to rival broadcasters bidding large amounts of money for the rights to show certain fixtures. The football World Cup attracts a global television audience of hundreds of millions; the 2006 final alone attracted an estimated worldwide audience of well over 700 million and the 2011 Cricket World Cup Final attracted an estimated audience of 135 million in India alone.[25] In the United States, the championship game of the NFL, the Super Bowl, has become one of the most watched television broadcasts of the year.[26][27] Super Bowl Sunday is a de facto national holiday in America;[28][29] the viewership being so great that in 2015, advertising space was reported as being sold at $4.5m for a 30-second slot.[26]