AHA! It was a big stunt… all of it! (Joaquin Phoenix)

His new movie, “I’m Still Here,” was performance. Almost every bit of it. Including Joaquin Phoenix’s disturbing appearance on David Letterman’s late-night show in 2009, Mr. Affleck said in a candid interview at a cafe here on Thursday morning.

“It’s a terrific performance, it’s the performance of his career,” Mr. Affleck said. He was speaking of Mr. Phoenix’s two-year portrayal of himself — on screen and off — as a bearded, drug-addled aspiring rap star, who, as Mr. Affleck tells it, put his professional life on the line to star in a bit of “gonzo filmmaking” modeled on the reality-bending journalism of Hunter S. Thompson.

Click to expand...