The fable of the Chicken and the Pig is used to illustrate the differing levels of commitment from project stakeholders involved in a project. The basic fable runs:
A Pig and a Chicken are walking down the road.
The Chicken says: “Hey Pig, I was thinking we should open a restaurant!”
Pig replies: “Hm, maybe, what would we call it?”
The Chicken responds: “How about ‘ham-n-eggs’?”
The Pig thinks for a moment and says: “No thanks. I’d be committed, but you’d only be involved.”
I heard of it from a Reddit comment about an easter egg location in Diablo 3 called “The Fowl Lair.” It’s filled with chickens and a single Greasy Pig.