Joaquin Phoenix to David Letterman: I’m sorry

NEW YORK -- Actor Joaquin Phoenix returned to David Letterman's "Late Show" on Wednesday to apologize for his wacky appearance last year that turned out to be an elaborate piece of performance art. "You've interviewed many, many people and I assumed that you would know the difference between a character and a real person, so - but I apologize," Phoenix said. "I hope I didn't offend you in any way." No offense taken, Letterman replied. The chance to lob jokes at Phoenix was like batting practice, he said.