What the hell was it? The chicken or the egg?
I've always (since elementary school) seen this as question of evolution vs. creationism.
If you side with evolution, then the egg came first. The two creatures which produced and fertilized the egg were not quite chickens yet, but one evolutionary step before. Although the egg they made contained a chicken.
If you side with creationism, then it was the chicken, as all the animals created were in their fully formed state, not as zygotes.
Yes, I was pondering such ideas before I was 10.
How about some questions which can actually be answered instead of just thought experiments. Although the sugar in coffee one was pretty good. Try this: if you mix a half liter of pure alcohol and a half liter of distilled water. What is the volume of the resulting mixture?