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Making fun of serious stuff with stupid jokes and insults. It's like being a jackass who thinks they're funny.
'This isn't a joke, you idiot!' said the teacher as the class laughed at the student who made a fart joke during a math test.
'I'm not crying, I'm just being facetious,' said the guy who failed the test and got a D.
During the funeral, the best man told a joke about the deceased's bad breath. Everyone was horrified.