Amy Schumer explains how Daniel Radcliffe got cast in 'Trainwreck' "I wanted it to be, hopefully, for Joaquin Phoenix. I wanted him to be trailing with dogs. I don’t know if that even reached him." Instead, the main role in Schumer's idea of what "the worst movie" would be, was put to Radcliffe. Schumer, who plays the semi-autobiographical and spectacularly single Amy in the film, explained: "They said, what about Daniel Radcliffe? And I just said, 'YES'." "He was just down to do it, we kept strapping dogs to him. He was so cool." "But being with him was like being with Jesus in Jerusalem. People saw him and just s--- themselves. More so than anybody else on the movie."