The quote from Nick Hornby's "A Long Way Down" illustrates the frustration of a conversation that feels unproductive and disjointed. The metaphor of a supermarket trolley with a wonky wheel captures the struggle of trying to steer the dialogue in a straightforward manner, only to be continually diverted. It reflects the common experience where discussions can veer off topic, making the speaker feel as if their efforts are leading nowhere.

This sense of being off-course can be relatable to anyone who has encountered similar challenges in communication. The author conveys a poignant feeling of helplessness, as each comment seems to derail the conversation further. Ultimately, it highlights the complexities of interpersonal dialogue and the difficulties that can arise when attempting to connect with others.