ba·thos 
/ˈbeɪˌθɑ:s/ noun
/ˈbeɪˌθɑ:s/ noun [noncount] formal : the sudden appearance of a silly idea or event in a book, movie discussion, etc., that is serious in tone
▪ The serious message of the film is ruined by the bathos of its ridiculous ending.
▪ The serious message of the film is ruined by the bathos of its ridiculous ending.
