We have explored how humour may be used to help non-speaking children learn to use language more effectively. There is evidence to suggest that language play, including using puns and other jokes, has a beneficial effect on a child's developing language and communication skills. Children with communication impairments are often reliant on augmented communication aids in order to carry on conversations, but these aids give little scope for generating novel language. This inhibits experimentation with language and limits the trying out of humorous ideas, which can in turn have a stultifying effect on language development. We have begun to address this deficiency in the language environment of the non-speaking child by providing a software tool which promotes humorous language play.

Starting from our previous research on the automated generation of punning riddles, we have designed and implemented a program which allows the user to experiment with the construction of simple jokes. The user interface of this system has been specially designed to be accessible to children with communication and physical disabilities. We have carried out tests of the usability and appropriateness of the system by observing and evaluating the use of our software by children.

You can even download the software, if you like.

When I saw this program, I thought immediately of the robot comedian from William Tenn's 1951 short story The Jester.

However, a closer fit would probably be the verse transcriber from Studio 5, The Stars by J.G. Ballard:

I was pasting down one of Xero's satirical pastiches of Rubert Brooke and was six lines short. I handed Tony the master tape and he played it into the IBM, set the meter, rhyme scheme, verbal pairs, and then switched on, waited for the tape to chunter out of the delivery head, tore off six lines and passed them back to me. I didn't even need to read them.

For the next two hours we worked hard, at dusk had completed over 1,000 lines and broke off for a well-earned drink.

Even earlier, sf great Stanislaw Lem described an electronic bard in his 1965 story The Cyberiad: Fables for the Cybernetic Age:

Trurl let the machine warm up first, kept the power low, ran up the metal stairs several times to take readings ) the machine was like the engine of a giant steamer, galleried, with rows of rivets, dials and valves on every tier) - till, finally satisfied all the decimal places were where they ought to be, he said yes, it was ready now...

Now that the potentiometers indicated the machine's lyrical capacitance was charged to the maximum, and Trurl, so nerous his hands were shaking, threw the master switch.

Update: Thanks to Ashley, we can look at another early reference, the mechanical jokester from Isaac Asimov's 1956 story Jokester; it's one of the stories about Multivac. End update.