Also at https://dynomight.net/chicken/

There's a Navy/Army version. Air traffic control: The chicken was instructed to hold short of the road. CIA: Chicken? What chicken? https://www.goatlocker.org/resources/nav/navy_sop.htm

Pink Floyd may have also said, it didn't cross the road, because it wanted to stay out of the road because it wanted to grow old. Almost verbatim from the Animals LP