Anthony Mackie recalls Malcolm-Jamal Warner's reaction after he sported Theo Huxtable's Gordon Gartrell shirt from "The Cosby Show" on "The Tonight Show."

Over the course of the show’s eight year run, this moment was not always taken as a given; the son, Theo Huxtable, was for years presented as a chronic underachiever, more interested in the typical trappings of teenage boyhood—friends,