I have a good one. This chicken joke is compliments of my 4 year old cousin. He said, "Why did the chicken cross the road? Because it was nailed to the fence!" then he started laughing for hours.....
Oh, what about an chicken underpass? Those are great and scary at night.
Since I'm obsessed with Invader Zim...
Zim: Who cares? When I rule this filthy planet, there will BE no chickens! MUAHAHAHA!
GIR: Let's go to my room, chicken!
Gaz: Who cares, I'm 10 levels away from beating this game, and if I lose, the chicken will pay!
Dib: THE CHICKEN'S AN ALIEN, I TELL YOU! YOU ALL THINK I'M CRAZY, BUT I HAVE PROOF!
Ms. Bitters: The chicken knows that the world is doomed...
That's all I can think of...