Late Show with David Letterman S10 E48 Harry Connick Jr., Larry Miller

During Mailbag, a viewer asks if Biff ever takes off his headset. Dave spins the query by asking what he listens to on those things. Biff then removes the headset and puts it up to the boom microphone. We can hear the opening theme and intro of Jay Leno's show. Biff quickly adds, ""I only listen to the monologue.""