Film critic Sarah Churchwell celebrates the classic romantic comedy When Harry Met Sally on its 20th anniversary. The film famously asked whether a man and a woman can really be friends. Sarah looks back at its iconic scenes which saw Meg Ryan and Billy Crystal spar and flirt over issues of gender politics, and considers how things have changed over the past two decades. Featuring contributions from the film's writer Nora Ephron, producer and fan of the film Dan Mazer, agony aunt Irma Kurtz, novelist Eva Rice and historian of the romantic comedy Frank Krutnik of Sussex University.