I found this interesting question on some geek’s (Roland Ahlborn) personal website. Some replies to the question are posted below. Click here for the complete list of answers.
I found it pretty interesting and came up with my version of it. Let me know if you have answer to it, if yes, post it in the comments area. 
EINSTEIN: Whether the chicken crossed the road or the road moved beneath the chicken depends on your frame of reference.
SADDAM HUSSEIN: This was an unprovoked act of rebellion and we were quite justified in dropping 50 tons of nerve gas on that chicken.
BILL GATES: I have just released the new ChickenOffice2000, which will not only cross roads, but will lay eggs, file your important documents, balance your checkbook, and spy on your neighbors for your benefit.
BUDDHA: Asking this question denies your own chicken nature.
KARL MARX: It was an historical inevitability.
MOSES: 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.
Shalin Jain: The chicken saw the Zebra crossing.
Post your answer in the comments area.
March 26th, 2004 at 5:50 pm
lol, here is mine..
Mr.Vajpayee: It is her right to cross the road, and we must FEEL GOOD ABOUT IT!
March 31st, 2004 at 6:33 pm
well what i guess the chicken crossed the road because may be the butcher was behind it,, haha,,
well i m sure my answer is too stupid,, but i m helpless coz my creativity sucks!!!
March 31st, 2004 at 6:34 pm
well what i guess the chicken crossed the road because may be the butcher was behind it,, haha,,
well i m sure my answer is too stupid,, but i m helpless coz my creativity sucks!!!
October 25th, 2004 at 6:59 pm
Because chickens do not require the biometric passports to cross the pond (atlantic ocean).