Joaquin Phoenix Acts Strangely on Late Show with David Letterman

Was it Andy Kaufman-like brilliance or is this dude just on something? Check out this clip of future-rap star Joaquin Phoenix falling apart on Letterman; click here for more footage.

Updated Apr. 25, 2017 4:07PM ET / Published Feb. 12, 2009 2:42AM ET

Was it Andy Kaufman-like brilliance or is this dude just on something? Check out this clip of future-rap star Joaquin Phoenix falling apart on Letterman; click here for more footage.