Peri Bathous, Or the Art of Sinking in Poetry  

https://en.wikipedia.org/wiki/Peri_Bathous,_Or_the_Art_of_Sinking_in_Poetry

 

"Pope introduced the use of the term "bathos" (Greek βάθος, depth, the antonym to ὕψος (hupsos), height) to mean a failed attempt at sublimity, a ridiculous failure to sustain it, or, more generally, an anticlimax.

Although Pope's manual of bad verse offers numerous methods for writing poorly, of all these ways to "sink", the method that is most remembered now is the act of combining very serious matters with very trivial ones"