The Walk the Line star returned to The Late Show for the first time since 2009, 15 years after attempting a stunt that left then-host David Letterman baffled. Joaquin, 50, admitted he had major remorse over the disastrous interview,

The actor was promoting the mockumentary 'I'm Still Here' when he delivered one of the strangest interviews ever recorded for late night television.

J oker star Joaquin Phoenix recently returned to The Late Show after a whopping 15 years — but something else also happened: he apologized for his infamous David Letterman interview from 2009 that took place on the show before Letterman turned the reins over to Stephen Colbert.