No link, but I don't know where else to mention this.
I just got the Chicken Joke.
You know, the old "Why did the chicken cross the road? To get to the other side!" joke. I just got it. It's actually supposed to be funny.
It's a subversion; the punchline is that there is no punchline. It's deep.
Too bad every kid in the world tells it like it's actually funny - kids don't get it, and then the effect is ruined.