By Jeff Labrecque
Updated September 22, 2010 at 03:17 PM EDT

I think I’d like to play cards with Casey Affleck. The Oscar-nominated actor, who directed his brother-in-law Joaquin Phoenix in the apparently fake documentary, I’m Still Here, visited The Tonight Show last night to reiterate his recent claims that it was just a movie and that Phoenix’s public meltdowns were simply part of the act. But his poker-face wasn’t exactly a mask of conviction. Question: “Everybody was in on it at the time [when Phoenix appeared disheveled on Letterman]?” Answer: “Uhhhh, well, you know… [breaks eye contact and mindlessly tugs right earlobe]… neither Joaquin nor I never talked to Dave…” Question: “Was it real drugs? Was he doing real coke in the movie?” Answer: “Uhhhhhhhhhhhhhh-hhhhhhhhhhhhh. No.” I suppose that’s better than, “Hmmm. Which scene?”

How convincing did you find Affleck? With Phoenix scheduled to return to Letterman’s show tonight, did Affleck’s performance make things easier for his star or more difficult?

Read more:

Casey Affleck admits his Joaquin Phoenix documentary wasn’t real: Are you at all surprised?

Joaquin Phoenix and the ‘I’m Still Here’ hoax: So maybe he really is as great an actor as Brando

Joaquin Phoenix will return to ‘Late Show with David Letterman’

Letterman writer claimed host knew about Joaquin Phoenix hoax

Letterman was in on the Joaquin hoax, writer says: Does the infamous interview play differently with the gift of hindsight?

Joaquin Phoenix on Letterman: Real or hoax, that was good TV