Batman ’66 #36 is a quintessentially campy Batman story by writers Art Baltazar and Franco Aureliani. Batman and Robin get locked out of the Batcave when the Minstrel steals the Shakespeare bust that opens the doors to the batpoles. They’re forced to use their prototype costumes that Bruce Wayne describes as “square.”
The Minstrel plans to literally dismantle the Dynamic Duo with his De-composer, an organ that emits a specific frequency to shake apart the Batmobile. Fortunately, Alfred chauffers the superheroes to the criminal hideout in the original Batmobile (not counting the red Sedan).
As the criminals are hauled off to jail, a female accomplice asks about the costume change.
“This above all; to thine own self be true,” Batman quotes Shakespeare.
The sentiment is lost on her so he paraphrases: “Sometimes you just can’t go wrong with a classic.”