Chad was talking about the abnormally large gavel that was used in the transfer of power to the new Speaker of the House, John Boehner, this week.
Apparently the folks at Late Show with David Letterman noticed it too. Last night Dave was smashing all sorts of things with an enormous gavel.
Guest Seth Rogan suggested he should smash an over-sized microphone as the finale. Dave turned around and gave Seth the honors.