  Previous papers presented Witscript and Witscript 2, AI systems for
improvising jokes in a conversation. Witscript generates jokes that rely on
wordplay, whereas the jokes generated by Witscript 2 rely on common sense. This
paper extends that earlier work by presenting Witscript 3, which generates joke
candidates using three joke production mechanisms and then selects the best
candidate to output. Like Witscript and Witscript 2, Witscript 3 is based on
humor algorithms created by an expert comedy writer. Human evaluators judged
Witscript 3's responses to input sentences to be jokes 44% of the time. This is
evidence that Witscript 3 represents another step toward giving a chatbot a
humanlike sense of humor.
