Woody Allen:
I mean, it was, it was ... a legal chicken ... It wasn't like it was a blood relative or anything. (And don't believe anything that Mia says about me.)

Aristotle:
To actualize its potential.

The Dead Sea Scrolls:
And God came down from the heavens, and He said unto the chicken, "Thou shalt cross the road." And the Chicken crossed the road, and there was much rejoicing.

Buddha:
If you ask this question, you deny your own chicken nature.

James Cagney:
It crossed twice. The dirty double-crosser.

Albert Camus:
It doesn't matter; the chicken's actions have no meaning except to him.

John Cleese:
This Chicken is no more. It has ceased to function. Bereft of life, it rests in peace. It's a stiff. If it wasn't nailed to the road it'd be pushing up daisies. It's snuffed it. It's metabolic processes are now history. It's bleeding demised. It's rung down the curtain, shuffled off the mortal coil and joined the bleeding Choir Invisible. This is an Ex-Chicken. Ergo, it did not cross the road.

Darwin:
Chickens, over great periods of time, have been naturally selected in such a way that they are now genetically predisposed to cross roads

Albert Einstein:
Whether the chicken crossed the road or the road crossed the chicken depends upon your frame of reference.

M.C.Escher:
That depends on which plane of reality the chicken was on at the time.

Bill Gates:
To purchase Chicken 2.01a, which will both cross roads and calculate the energy it used. There are bugs, yes, but if you uninstall Traffic 2.0 and Farmer 1.2 it will run. If it freezes at WhiteLine 2.0, we have a patch ...

Dirk Gently (Holistic Detective):
I'm not exactly sure why, but right now I've got a horse in my bathroom.

Ernest Hemingway:
To die. In the rain.

Saddam Hussein:
It is the Mother of all Chickens.

Carl Jung:
The confluence of events in the cultural gestalt necessitated that individual chickens cross roads. This brought such occurrences into being.

Immanuel Kant:
The chicken, being an autonomous being, chose to cross the road of his own free will.

Martin Luther King, Jr.:
I envision a world where all chickens will be free to cross roads without having their motives called into question.

Machiavelli:
The point is that the chicken crossed the road. Who cares why? The ends of crossing the road justify whatever motive there was.

George Orwell:
Because the government had fooled him into thinking that he was crossing the road of his own free will, when he was really only serving their interests.

Plato:
For the greater good.

Pyrrho the Skeptic:
What road?

Jean-Paul Sartre:
In order to act in good faith and be true to itself, the chicken found it necessary to cross the road.

O.J.Simpson:
It didn't. I was playing golf with it at the time.

B.F. Skinner:
Because the external influences, which had pervaded its sensorium from birth, had caused it to develop in such a fashion that it would tend to cross roads, even while believing these actions to be of its own freewill.

The Sphinx:
You tell me.

Joseph Stalin:
I don't care. Catch it. I need its eggs to make my omelet.

Oliver Stone:
The question is not "Why did the chicken cross the road?" but is rather "Who was crossing the road at the same time whom we overlooked in our haste to observe the chicken crossing?"