A lot can change in a person’s life in just 19 months—as David Letterman (and his wife) would know. But how has the past year and a half treated Joaquin Phoenix?

Well, we may get an answer to that question when the Oscar nominee returns to the Late Show next week. That’s when Phoenix—who made a memorably awkward appearance on that program in Feb. 2009—is scheduled to promote his film I’m Still Here.

If Joaquin still isn’t the mood to speak, maybe Dave could at least get Phoenix to do a rap? You better set your TiVos for September 22 just in case.