All are improbable or impossible. This is considered an acceptable range of magical belief in our society today. We all want to believe in magic and chance. That's why people buy penny stocks, lottery tickets, bet on horses and play sweepstakes. While not very probable, it is theoretically possible to win.
Myths die hard.
The film is about a guy who holes up in his room all summer, subsisting on coffee and cigarettes. He constantly listens to a local radio station giving away a million dollars, waiting for the call he knows will come. When the call comes the phone goes dead. The brothers claim the film inspired them. The moral of the tale for them was that the chance to win big money commands widespread attention and people will respond.