preposterous - Contrary to reason or common sense; utterly absurd or ridiculous.
When Sandy's stock broker called and suggested that he sell half his stocks because he felt the market was overvalued, Sandy thought the idea was preposterous - but it turned out that his stock broker was right.
spoof - A humorous imitation of something, typically a film or a particular genre of film, in which its characteristic features are exaggerated for comic effect
During the 2016 election season, Kate McKinnon would act in a spoof where she portrayed Hillary Clinton.