Instagram/Paul Shaffer & David Lett TV Relive the magic as David Letterman reunites with Paul Shaffer at the Netflix Is A Joke Festival. Nostalgia and comedy collide at the Montalban Theatre. May 8, 2026 AceShowbiz - Last night at Los Angeles's historic Montalban Theatre, fans were treated to a nostalgic return to the golden era of late-night television during the Netflix Is A Joke Festival presentation of This Better Be Funny with David Letterman and John Mulaney.