An absurdity is something ridiculously foolish. The U.S. declaring war on Fiji would be an absurdity.

This is the noun form of the adjective absurd, which means silly, hard-to-believe, and kind of crazy. Unless it's Halloween, it would be an absurdity to show up to school in a chicken suit. If you teacher taught math class with a fake French accent, that would also be an absurdity. A lot of comedies are full of absurdities, because an absurdity can be funny. If you're good at thinking of absurdities, maybe you should be a comedy writer.

Definitions of absurdity
  1. noun
    a ludicrous folly
    “the crowd laughed at the absurdity of the clown's behavior”
    synonyms: fatuity, fatuousness, silliness
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    type of:
    folly, foolishness, unwiseness
    the trait of acting stupidly or rashly
  2. noun
    a message whose content is at variance with reason
    synonyms: absurdness, ridiculousness
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    type of:
    bunk, hokum, meaninglessness, nonsense, nonsensicality
    a message that seems to convey no meaning
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