I actually was going to go for the "why did the chicken not cross the road?". Then I wanted to say "because it was in a price negotiation with the author to sell its eggs", but it was too wordy. Then I thought, "because the author had it as an egg before it could hatch", but it was too dark... Then I gave up.

Well, I guess you cannot make a chicken joke without breaking some eggs (I'll stop now. I'm really sorry, but come on, it's Sunday).