#JoaquinPhoenix returned to #TheLateShow for the first time in 15 years and expressed “regret” over his infamous 2009 interview with #DavidLetterman. Reflecting on the stunt tied to his mockumentary "I’m Still Here," Phoenix told #StephenColbert, “It was horrible. I regret it. I’m so sorry… I’ll never do it again.” 🔗 link in bio for more on this story.