I don't recall seeing this episode in my admittedly too-copious youthful rerun viewing, but Shakespeare Geek mentioned it at some point, and I tracked it down.
In this episode, everyone in the Brady household is in a state of high excitement and emotional excess.
All right, that doesn't really narrow it down all that much.
In this episode, everyone in the Brady household is in a state of high excitement and emotional excess because the school is putting on Romeo and Juliet and Marsha is hoping for a part.
The clips below will walk you through the plot, and they'll pay particular attention to the various and sundry Shakespeare-related moments throughout.
The Opening Gambit: Will Marsha be Excited about the Role of Juliet?
Alice, you played once i' the university, you say?
Shakespeare Don't Get No Respect!
Every year, I set aside one day in my Shakespeare and Film class for what the syllabus terms "Mystery Shakespearean Derivatives." I think this episode might make the cut this year.
Links: The Film at IMDB.