Some years ago, a skilled aircraft mechanic friend sought approval from the FAA to do a fairly simple modification to his Super Cub airplane. He was told "sure, no problem. Send us a couple of sketches, we will do a couple of phone calls, and we'll get it done." So he did the work, and the requirements kept growing and growing, and ended up requiring several months, over 40 full sized mechanical drawings and 40 hrs on the phone.
So, now when we hear of a project that has all the earmarks of infinite "mission creep" we just say "sure, a couple of drawings, a few phone calls.." and have a good laugh. Thought maybe you all might find that phrase handy.