If You're Religious: The chicken came first. God created all CREATURES, not eggs. You lot should know better. If you you believe in the theory of evolution (or science in general): The Egg came first. Quite clearly, the chicken we have known today wouldn't become the chicken while it's pre-evolutionary form was alive, therefore it would of evolved into the chicken while inside the egg. If you believe in the theory of evolution, but insist on "In order for it to be a chicken egg, it must come from a chicken": Then the chicken came first. It's simply one step on from the answer above. The pre-evolved form gave birth to the egg, which out came the chicken, and then the chicken laid the egg. THERE. Solved. Whether you believe god invented all creatures from the get go or they evolved into what we are today is your business, I'm just giving you the answers all the while being in the context of your various beliefs. I win.