Now, some people do this for shock value. Shock is just another uptown word for surprise. Granted it has a different quality to it, but a joke is about surprising someone. I'm a great believer in context. You can joke… — George Carlin Copy Share Image
I 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 Copy Share Image