In Joseph Heller's novel "Catch-22," the character Yossarian experiences a profound realization regarding the concept of Catch-22. He appreciates the straightforward yet paradoxical nature of this bureaucratic rule, which illustrates the absurdity and complexity of military life. His reaction, a respectful whistle, signifies his recognition of the catch's significance and impact on the lives of those entangled in its grasp.

The conversation between Yossarian and Doc Daneeka further highlights the inherent futility of the situation. Doc Daneeka confirms Yossarian's observation by acknowledging the effectiveness of the Catch-22 rule, suggesting that it encapsulates the hopelessness faced by the soldiers. The simplicity of the clause juxtaposed with its far-reaching consequences underlines the irony of their predicament.