Downey played understated roles in many beloved sketches (First CityWide Change Bank), wrote jokes for Norm Macdonald’s fabled run on Weekend Update, and dominated the show’s political writing (Dana Carvey gives him credit for his George H.W. Bush line “Na Ga Da It”) for decades until he retired in 2013. He might be best known for an appearance in “Billy Madison,” when he tells Adam Sandler he said something so idiotic that “everyone in this room is now dumber for having listened to it.”