Test of endurance
Pole sitting is the practice of sitting on top of a pole (such as a flagpole) as a test of endurance. A small platform is typically placed at the top of the pole for the sitter. Led by the stunt actor and former sailor Alvin "Shipwreck" Kelly, flagpole sitting was a fad in the mid-to-late 1920s, but mostly died out after the start of the Great Depression. 
History and 1920s fad.
Pole sitting is predated by the ancient ascetic discipline of stylitism, or column-sitting. St. Simeon Stylites the Elder (c. 388–459) of Antioch (now Turkey) was a column-sitter who sat on a small platform on a column for 36 years.
Flagpole sitting was a fad in the mid-to-late 1920s. The fad was begun by stunt actor and former sailor Alvin "Shipwreck" Kelly, who sat on a flagpole, either on a dare by a friend or as a publicity stunt. Shipwreck's initial 1924 sit lasted 13 hours and 13 minutes. It soon became a fad with other contestants setting records of 12, 17 and 21 days. In 1929, Shipwreck decided to reclaim the title. He sat on a flagpole for 49 days in Atlantic City, New Jersey, setting a new record. The following year, 1930, his record was broken by Bill Penfield in Strawberry Point, Iowa, who sat on a flagpole for 51 days and 20 hours, until a thunderstorm forced him down.
For the most part, pole sitting was confined to the 1920s, ending with the onset of the Depression.
Film.
In a dialog sequence early in the 1932 movie "The Most Dangerous Game", the character Zaroff introduces the protagonist Bob to his guests as a celebrity, upon which Martin guesses (incorrectly) that Bob might be a flagpole sitter.
In 2004, Danish film "Tid Til Forandring / What's Wrong With This Picture" the pole-sitting competition is prominently featured as a part of the film with the main character Inge winning the contest by abandoning the sitting as the sole remaining participant when a dog resembling her own passes by. 
References.
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