conversation piece
From Longman Dictionary of Contemporary Englishconversation pieceˌconverˈsation ˌpiece noun [countable] THINGsomething that provides a subject for conversation – often used humorously about objects that seem very strange or uglyExamples from the Corpusconversation piece• That would be a conversation piece.• Most important of all it will become a conversation piece.• The suspense mounted and conjecturing on who the new chief would be became the community conversation piece.• Talk about your party conversation piece!