Humor is an essential human trait. Efforts to understand humor have called
out links between humor and the foundations of cognition, as well as the
importance of humor in social engagement. As such, it is a promising and
important subject of study, with relevance for artificial intelligence and
human-computer interaction. Previous computational work on humor has mostly
operated at a coarse level of granularity, e.g., predicting whether an entire
sentence, paragraph, document, etc., is humorous. As a step toward deep
understanding of humor, we seek fine-grained models of attributes that make a
given text humorous. Starting from the observation that satirical news
headlines tend to resemble serious news headlines, we build and analyze a
corpus of satirical headlines paired with nearly identical but serious
headlines. The corpus is constructed via Unfun.me, an online game that
incentivizes players to make minimal edits to satirical headlines with the goal
of making other players believe the results are serious headlines. The edit
operations used to successfully remove humor pinpoint the words and concepts
that play a key role in making the original, satirical headline funny. Our
analysis reveals that the humor tends to reside toward the end of headlines,
and primarily in noun phrases, and that most satirical headlines follow a
certain logical pattern, which we term false analogy. Overall, this paper
deepens our understanding of the syntactic and semantic structure of satirical
news headlines and provides insights for building humor-producing systems.

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