Friday’s edition of the Non Sequitur comic strip. (I get it by subscription via the indispensible gocomics.com).
This is Wiley Miller‘s take on an old joke. The concept was also grist for a memorable Saturday Night Live sketch in November, 1996. (Transcription here.)
The premise of the mockery is that musical theater is an idealized, stylized form of entertainment which exaggerates and distorts reality for artistic purposes that can occasionally be off-putting and disorienting for those who have no imagination or sense of humor.
Not unlike newspaper cartoons and late-night comedy shows.