Anti-climax or Bathos: Anti-climax or Bathos is a statement in which there is a sudden fall from the serious to trivial, from the sublime to the ridiculous. Example of Anti-climax or Bathos:
Not louder shrieks to pitying heaven are cast,
When husbands, or when lapdogs breathe their last;
(Pope: The Rape of the Lock)
Here is a sudden fall of importance from husbands to dogs. Poets use anti-climax to produce humour.