While Runaway Train lies nearer to the sublime on the continuum, this episode of Magnum, P. I. moves along the scale toward the ridiculous.
I know very little about the conventions of the show, but this episode centers on a character named Higgins who is struck on the head by a croquet ball just before a 1920s Theme Party begins. He imagines himself to be the great (albeit fictional) Shakespearean actor Sir Fearing Pangborn. [As a side note, does anyone know whether that name is parodying any actor in particular? Sir Herbert Beerbohm Tree? John Barrymore?] [Additional Note: See the comments below for the solid suggestion that the character actor Franklin Pangborn is the object of the mild parody.] Another character (T.C., for those in the know) is dressed as Paul Robeson—but he claims he's playing Paul Robeson playing Brutus Jones, so there's no additional Robeson-as-Othello material in this episode.
Here's a brief sample. Warning: It's quite silly, and impressional people should not be allowed to assume that Magnum's shirt-and-shorts combo is appropriate attire in the twenty-first century.
Links: The Episode at IMDB.