The discussion revolves around a classroom exercise where students were asked to bring an "absolutely useless object." Participants debate the concept of "uselessness," with some suggesting that the human appendix is a prime example. Others argue that any item brought with intent to participate gains a form of usefulness, creating a paradox. The conversation explores various interpretations of uselessness, including items like burnt-out light bulbs and outdated information. Some participants highlight the inherent contradictions in defining something as "absolutely useless," suggesting that the exercise itself challenges perceptions and encourages critical thinking. The dialogue becomes increasingly philosophical, with discussions on the nature of answers and the paradox of the riddle. Overall, the thread emphasizes the complexity of defining utility and the thought-provoking nature of the exercise.