I'm totally applying assumed Creative Commons rights and ripping this post from Jason verbatim, since it says everything I want to.
Ryan NorthThey are "sexcellent". That is a pun for you, you will find lots of puns on the internet! Also: blonde jokes.
Ryan NorthI speculate that the genesis of the chicken-joke lies in some situation such as the one illustrated above, but over time the original context of the joke was lost, which left the chicken sadly decontextualized.
Ryan North