This article explains the concept of the "spirit of the game" in the sport of ultimate frisbee. It emphasizes that the rules of the game do not require referees or umpires, as all players are expected to adhere to the standards of fair play. The article strongly encourages players to self-referee, emphasizing the importance of being honest and taking responsibility for any disagreements or rules violations. It also notes that player-to-player communication is a key tool in this process, and encourages players to focus on resolving disagreements in a respectful and equitable manner.