Which came first?

The Chicken or the Egg?

So this Egg and this Chicken are going at it pretty fast and furious in bed and suddenly the chicken groans, rolls over and lights up a ciggy, looking very content.

The egg rolls to the other side and says "Well, that answers that question".

(Inspired by a post with the same name, but very different content on Hari's blog, I remembered an old but favourite joke.)