8x42 - Late Show with David Letterman

During the annual "Halloween Costumes" segment, Calvert claims a dead fish as his treat and Dave's car the morning after All Hallow's Eve; George Clarke gorges himself on candy in the basement; Dave shows a clip of Kenny Sheehan's guest role as the metal shop teacher on the October 29 episode of "Ed"; after being mocked on last night's Tonight Show, Dave does a crude Jay Leno impression.