Anatomy of a joke: Michigan J. Frog
Specifically, One Froggy Evening, MJ's original appearance.
How on earth is this a deconstructed joke? Well, about that.
It works on two levels. First, if you read wikipedia, they'll tell you that Chuck Jones was riffing on a set of reasonably well-known vaudeville routines. At the top level, I think that's right.
Guy finds a dancing frog, sees dollar signs, runs into the talent agent, the frog doesn't perform for anybody else, no dollar signs, guy goes broke and ditches the frog, roll credits.
Back at the time, then, running to the talent agent to go Hollywood was something you could do, if you lived in New York or L.A. at least. The rest of us would just have to dream.
So, in that reading, it's just Chuck Jones riffing, here's funny character and I've got a few minutes of short to fill, typical gag, right?
On the other hand... (before we go on, know that I'm going to be talking about the joke that pro comedians consider to be the most deliberately over the top, disgusting joke that can be told, link goes to wikipedia rather than a video, you can search for the live versions yourself, I just recommend you do it from a place where no one is going to jump on you for playing really nasty, raunchy videos)
On the other hand... Chuck Jones figured out how to tell The Aristocrats to kids.
Remember the setup for The Aristocrats? Guy walks into a talent agent | Fill with the most ridiculous, disturbing, over the top nastiness you can imagine | agent asks "what do you call that act", guy stands up proudly and says "The Aristocrats!"
Guy finds a frog, the frog dances and performs, guy brings frog into agent's office | crickets | agent kicks guy out of his office.
In other words, Chuck Jones answers the question "Can you tell the world's dirtiest joke to a kid without parents or censors realizing it?" in the affirmative.
If that's not the ultimate deconstructed humor...