Richard Brautigan, in his work "Trout Fishing in America," expresses a unique ambition to conclude a book with the unexpected word "Mayonnaise." This peculiar choice highlights his playful and unconventional writing style, which often blends absurdity with deeper reflections on life. The desire to end a literary work with such an ordinary yet quirky word challenges traditional narrative norms and invites readers to think outside the box.

By incorporating elements of the mundane into his storytelling, Brautigan creates a fresh perspective on everyday experiences. The word "Mayonnaise" symbolizes the blend of the ordinary with the extraordinary, reflecting his view that even commonplace things can carry significance. This creative approach exemplifies the charm and whimsy that characterize Brautigan's literary voice, making "Trout Fishing in America" a memorable and engaging read.