2) A joke similar to 1., but with the intention of frustrating or confusing the audience, rather than pleasing them.
(A minute of silence)
Mike: Bill, that's a lone, confusing reference, not a joke. It is also not a witty observation. You have now performed a hat trick of no-joke jokes, and unless you stop talking, we will throw you out of your own party.
2) An intentional No-Joke Joke:
Q: What is the difference between a duck?
A: One of it's legs are both the same!