Most. Retarded. Question. Evar.
It should be "chicken egg or chicken first" debate.
Obviously there were eggs before there were chickens, unless chickens were the first animal to lay eggs, and chickens as we know them today almost certainly evolved from another kind of bird which laid different eggs, so eggs came first.
The egg the chicken hatched from was laid by another type of bird, and the DNA in that egg mutated slightly from its parents DNA and became a chicken, so depending on which way you look at it, either statement can be true.
If you see the egg laid by a non-chicken with a chicken in it to be a chicken egg, then the egg came first, but if the egg laid by the non-chicken but with a chicken in it is a non-chicken egg, then the chicken came first.
IMHO.