I believe this came from Bill Greenwood a while back.
Some guy inherits a warbird, and it has got so many tight and hard to access spaces that the regular mechanics at the jet dealer don't know what to do. They advise the owner to get an "aviation maintenance monkey". So he goes to the local pet store where he knows they have a lot of monkeys for sale. The shrewd storeowner does not blink when he asks for a maintenance monkey. The owner is shown the first cage, with a price on it of $500. He asks about the normal looking monkey and is told that that is an A & P monkey, and that it can fix his airplane. Then he sees the next row where the price is $1000. He asks why the difference? He is told that this is an I A monkey who can not only fix the plane, but also sign off all the work as legal.
As the owner is about to buy one and leave he sees one more cage in the back and is astounded to see the price of $5000! So he asked the owner what kind of work that monkey can do to justify that price? He is told that as far as they can determine this monkey has never done anything other than stand around and scratch himself, but that the sign on the cage that he came in says that he is a pilot.
