The Gay Joke on Gielgud in "Twilight of the Gods" (Season 7) Episode
I was a bit surprised in the episode where John Gielgud's character (a quintessential Oxford don) says (to dispel the notion that "if you like Wagner's operas you like Hitler" etc) --- "if I like Noel Coward what does that mean about me". And the American prof's character says (sotto voce) "a closet gay" and Gielgud doesn't quite hear it and goes "hmmm?" and that's it. Just a small moment that showed that the esteemed actor Sir John could take a joke!