He's a Woman, She's a Man (金枝玉葉 1994), directed by Peter Chan Ho Sun.
Starring Leslie Cheung, Anita Yuen, Carina Lau.
The famous comedy of Leslie. He has well-known line in this film: "Whatever you're a boy or girl, I just know that I love you." Really good film. The theme song "Chase" of Leslie won Best Original Song Award.