Samuel Beckett

Waiting for Godot is a play by Samuel Beckett. It has been referenced multiple times in the Arthur series:
 * The name of the episode "Waiting to Go" references the play. It's plot is also basically the same: two characters are waiting endlessly for someone.
 * Mr. Ratburn's two fish are named Vladimir and Estragon. These names are also the names of the main characters in the play.