Three Men on a Horse is a 1936 comedy film adapted from the Broadway play of the same name written by George Abbott and John Cecil Holm. A mildmannered greeting card poet has the uncanny ability to pick winners in horse races.
The next day, Erwin makes his picks, but discards his first choice for the sixth race. This arouses Charlies suspicions. His fear about being double crossed infects the other two. Patsy forces Erwin to bet all his winnings on his second selection for that race. However, Erwin had told Patsys girlfriend Mabel Joan Blondell that he never bet on the horses because he was worried that doing so would take away his ability.The whole gang go to the racetrack to watch the race. Erwins discarded choice wins, barely edging his second pick. When they get back to the hotel, Patsy starts beating Erwin. Then they hear on the radio that the winner has been disqualified. This inspires Erwin to punch Patsy back. When Clarence shows up, Erwin punches him too. Following close behind, Carver desperate to fulfill a contract for Mothers Day cards offers Erwin a raise and a new office, which Audrey persuades him to take. Erwin bids the gamblers goodbye, telling them that having finally bet for real, he has lost his knack. ........
Source: Wikipedia