Excerpt from the book Darwin’s Dangerous Idea, Daniel dennett.
Danny Hillis, the creator of the Connection Machine, once told me a story about some computer scientists who designed an electronic component for a military application (I think it was part of a guidance system in airplanes). Their prototype had two circuit boards, and the top one kept sagging, so, casting about for a quick fix, they spotted a brass doorknob in the lab which had just the right thickness. They took it off its door and jammed it into place between the two circuit boards on the prototype. Sometime later, one of these engineers was called in to look at a problem the military was having with the actual manufactured systems, and found to his amazement that between the circuit boards in each unit was a very precisely milled brass duplicate of the original doorknob.