In a heartwarming reunion, David Letterman and Paul Shaffer brought back memories of the Late Show days, with Shaffer's surprise appearance and a captivating performance. The event, Netflix Is A Joke Presents: This Better Be Funny, showcased Letterman's wit and Shaffer's musical prowess. The former host's opening set, reminiscent of 'This is Your Life,' set the tone for the evening, with a blend of nostalgia and humor. The highlight was Shaffer's performance of Frank Sinatra's 'That's Life,' leaving the crowd in awe. The evening's most memorable moments belonged to Letterman and Mulaney, who shared amusing stories and insights into their careers and personal lives. Mulaney's unique relationship with his Vietnamese relatives and his journey to becoming a comedian were particularly captivating. The event also marked a reunion of sorts, with Letterman and Mulaney discussing their collaborations and Mulaney's recent projects. The evening concluded with a lighthearted exchange about Michael Jackson's biopic, leaving the audience with a sense of camaraderie and a renewed appreciation for the talents of these legendary figures.