Trivia
A Brief History of History/The Incredible Gnome in People's Mouths: "Gerard"/The Prisoner's Dilemma/Math-terpiece Theater: Beachballs
Animaniacs
The Prisoner's Dilemma sketch draws a number of plot points and visual references from the cult classic 1967 series, The Prisoner (1967) (and/or the 2009 AMC remake The Prisoner (2009)).