1) Joaquin Phoenix has had a psychotic break and is, in fact, bat**** crazy.
2) Joaquin Phoenix is Andy Kaufman's secret love child.
Because either he has no idea what's going on in his life right now, or he's pulling a tremendous prank on the world. I'm hoping it's 2), because otherwise someone close to him should have him checked out by someone soon.
Late Show - Where's Joaquin Phoenix? - 2/11/09