Joaquin Phoenix Returns to Letterman

Over a year after his trippy appearance on Letterman, a newly de-bearded Joaquin Phoenix returned to explain what motivated him to hoax Dave in the first place. Dave was not amused.

Updated Apr. 24, 2017 5:38PM ET / Published Sep. 23, 2010 6:04AM ET

Over a year after his trippy appearance on Letterman, a newly de-bearded Joaquin Phoenix returned to explain what motivated him to hoax Dave in the first place. Dave was not amused.