I'm a Principal at ThoughtWorks, classical composer, and physics amateur.
Dark software humor picked up off the XP group on Yahoo!:
and a pony
Common usage: "I want faster compiles, more hardware, and a pony."
Meaning: "I know I'll never get any of these things so why not add a pony to the list just to make myself feel better?"
Also happens when management wants to squeeze a #12 bag of features in a #10 slot of schedule, a ripe moment for story cards and the planning game.