In Philip K. Dick's novel "Ubik," a moment of frustration arises when a character encounters a door that interestingly demands a nickel to open. This unusual and thought-provoking scenario highlights themes of reality and the barriers imposed by material demands, emphasizing how mundane interactions can take on unexpected significance in a surreal context.

The quote encapsulates the essence of the book's exploration of consumerism and the blurred lines between the physical and metaphysical worlds. It serves as a reminder of the complexities of existence within a society driven by commerce, inviting the reader to reflect on the implications of such interactions in their own lives.