party piece
From Longman Dictionary of Contemporary EnglishRelated topics: Leisureparty pieceˈparty ˌpiece noun [countable] British English DLa song, dance etc that you often perform to entertain people at partiesExamples from the Corpusparty piece• Then came Solano's party piece, and a frantic finish.• Together they revived their party piece from the Sixties, Open Country, which like everything they played, was superb.