Joaquin Phoenix, David Letterman Joaquin Phoenix, David Letterman

Few can forget Joaquin Phoenix's bizarre appearance on Late Show with David Letterman in February. Now the actor is returning for round 2 on Wednesday, Sept. 22.

While promoting his last dramatic film, Two Lovers, the 35-year-old actor appeared on Letterman in 2009 looking disheveled and behaving strangely. Despite Letterman's best efforts to get Phoenix talking — asking him about his co-stars, his beard, and his "days with the Unabomber" — Phoenix gave terse, one-word answers.

Check out videos from Late Show with David Letterman

At the time, Phoenix had recently announced his decision to take time off from acting to focus on a music career as a rap star. "I think you're taking a little time off tonight," Letterman joked during the interview, which attracted more than 8 million views online.

Still, Phoenix offered to come back and perform on the Late Show. Letterman laughed, but promised to keep him in the rolodex.

Check out photos of Joaquin Phoenix

Phoenix is currently promoting his new documentary, I'm Still Here.

Watch the interview here:

CBS will also re-air Phoenix's full interview on Thursday, Sept. 16.