"Evolution is like a box of baboons, you never design what your gonna implement." That almost sounds like it could mean something, doesn't it?
I've got a script running on my blog named "Wisdom of the Drunken Sages" (it's one of mine). It takes the structure of a familiar sentence (like the Forrest Gump quote used in this example), and plugs in different words. It caught my attention with the sentence above a minute ago.
So I'm imagining a bunch of baboons in a box doing their evolutionary thing (I'm not visualizing in detail, mind you!) Maybe you threw them in the box thinking that survival of fittest would yield a super baboon. But instead a random mutation turns out a saber-tooth butterfly.
Just like many computer programming projects, what you designed and what you implemented are two totally different beasts.